As with any glass type, or art in general, different circumstances and people have adopted different names for slag glass. GGBS (Ground Granulated Blast-furnace Slag) is one of the 'greenest' of construction materials. Lighting FixturesPettingell-Andrews Company, c. 1910, Gas and Electric LampsWelsbach Company, c. 1910. This color pattern led to the "brown malachite" and "brown marble" names. Instead of slag, they mixed purple glass with a white-colored glass that did not contain any iron slag. Challinor Taylor and Co. was an early U.S. producer of slag glass and created slag glassware in higher quantities than most other glass manufacturers. Portland slag cement, which is most commonly used in the region, was used for the study complying with IS 455 [21].Its specific gravity was 2.87 having initial and final setting times of 70 minutes and 480 minutes, respectively.For fine aggregate, natural sand was used, having a maximum size of 4.75 mm.Its specific gravity was 2.72, conforming to Zone-III, and having a fineness modulus of 2.313. How to tell the difference between obsidian and slag glass. With the first versions of slag glass being an opaque brown with cream to caramel-colored streaks, slag glass is also known by the names of brown malachite or brown marble vitro porcelain (brown marble). Most manufacturers use up tp 40% to 60% recycled glass content. This does use the broader definition of slag glass that includes white marbling produced through any method. Slag glass gets its name from slag, or the byproduct of steel production. Learning how to identify and value this glass can help if you are looking to collect or just learn more about this interesting glassware. United States. Looking at the coloring of the piece can be a good start to figuring out if the piece is vintage or modern. You can determine antique slag glass with a few steps: Slag glass antique items can run anywhere in value from a low of $50 to a high of $1,500. Work with a qualified appraiser to help you identify the manufacturer and type of slag glass antiques you have, including antique glass insulators, to determine the true market value. All slag glass will be a marbled mix of some opaque color with opaque white. [4]. Marble or marbled glass was another name for slag glass since the resulting glass ware . Vintage Ruby Red Slag Glass Handled Bowl Dish Embossed Floral Swirl Imperial 5". Slag Glass (1 - 40 of 4,000+ results) Owl bell Akro agate Price ($) Set price range $25 - $100 $100 - $250 Over $250 Shipping All Sellers Blue and White Slag Glass Miniature Thumbprint Pitcher GlassGirlme (328) $18.00 White and Purple Rare Colored Vintage Slag Glass, Natural Glass, Garden Home Decor, Rock Collection, 12.8 oz BuyMeCrystals (172) 3 Beds. Actual prices per ton ranged in 2019 from a few cents for some steel slags at a few locations to about $120 or more for some GGBFS. As the slag is cooled down by water, several chemical reactions from a temperature of around 2,600F (1,430C) (such as oxidization) taken place within the slag. Pre-Owned. Top Rated Plus. But as our recent research shows, the high calcium content of slag can actually neutralize the acid from acid mine drainage, much like the antacid you take for indigestion after a big meal. All Listings filter applied; Delivery Options. Rock wool, a man-made material consisting of natural minerals like basalt or diabase. The company, based in Jeannette, Pennsylvania, rebranded in 1898 and took on the name Jeannette Glassware. $75.00 + $67.15 shipping. 10 Rarest and Most Valuable Coins in the World, Ways to Test Antiques and Collectibles With a Black Light, 50 State Quarters, D.C., and U.S. Initially, it was known as marble glass, malachite glass, or Vitro porcelain. One or two swipes of the stone and your edge should be just fine. One of the most common applications of vintage slag glass is in lighting. Its a shame we cant come up with a nicer name. Furthermore, slag can be classified based on the abundance of iron among other major components. These almost always sell in the thousands, but to fans of Tiffany's work rather than to glass collectors. Production of slag glass originated in late 19th century England. In this case slag, a by-product from iron smelting, is mixed into the molten glass before pressing. One item where slag glass was used often was in the creation of antique oil lamps, chandeliers and lampshades, particularly during the Art Deco and Art Nouveau periods during the late 19th and early 20th century. Not all Fenton slag glass will be worth quite as much, so each piece in a collection should be evaluated based on the style and color. Is slag glass natural? According to Norman Webber, some companies referred to slagware as end of the day wear because glassmakers collected slag from the surface of iron right before they poured it at the end of the day. Grapevine, TX 76051. Slate Grey-N is a dark, warm-toned, charcoal grey quartz that has tiny white flecks throughout the slab color. A review of steel slag as a substitute for natural aggregate applied to cement concrete. The result is a material that lies somewhere between porcelain and glass. These lamps rarely sell for less than 100 dollars. Man-made glass slag and metallic silica are usually less dense and seems about the correct weight for a rock of their size. As molten iron cools, a silicate slag forms on top of it. Slag glass was often used in lampshade production as well as for crafting many different types of decorative objects. Welcome to Costa Sea Glass, the home of Spanish Sea Glass. Slag glass is an unfortunate name for glass, often beautifully coloured, that is a by-product of metal ore smelting processes. Some handmade collector marbles are small works of art that can command big prices. Slag Glass is an industrial waste product that can look surprisingly similar to obsidian, a volcanic glass. Sellers with highest buyer ratings; Slag glass is a vintage collectors item, but is also produced modernly and can be found in a variety of colors. These easily sell for thousands when in excellent condition, with Tiffany being the top of the line, of course. 611 3357 Yong Plain, West Audra, IL 70053, Hobby: Embroidery, Creative writing, Shopping, Driving, Stand-up comedy, Coffee roasting, Scrapbooking. Slag is the byproduct of steel production. Brand New. Save my name, email, and website in this browser for the next time I comment. However, stained glass will not have any of the milky-colored streaks that slag glass does. Sowerby in Gateshead, England is believed to be the first glass foundry to create slag glass. Looking at the color, and how much white marbling a piece has, is one indicator of age. (Video) Is it slag? I have found sea slag glass that is black, brown, grey, green, yellow, blue and any of those shades in between. Real slag glass will not have a solid color but rather a blended, marble look. As a co-product of steelmaking, slag is typically produced either through the blast furnace - oxygen converter route or the electric arc furnace - ladle furnace route. or Best Offer. $24.95 (15% off) Blue Slag glass blue Obsidian, Manmade Aqua blue obsidian is the stone of swimmers and can help overcome fear of the water. However, the most important application is construction. They are a great way to add color to any room. The strict definition of slag glass means that it has powdered silicate slag from iron smelting mixed into the glass to create streaks. It has distinctive a distinctive knob pattern and comes in a variety of colors. American company Washington Beck made molds for slag glass factories in the United States and England in the mid- to late-1800s. Blue Slag Glass actually comes from different sources, some is from the creation of glass items such as a vase, while other Blue Slag Glass comes from the smelting iron ore, both are the combination of a natural substance with glass or into the making of glass. A similar look was created around the same time by U.S. manufacturers Northwood and Dugan. Traditional slag glass gets its creamy colored streaks from something called slag. With excess phosphate in water being a significant issue in the Chicago-Gary area, this benefit from slag could be another use for the material and could decrease the need to mine new natural materials for water treatment applications. Slag. Stone Shop, InSpyritMetaphysical (5,660) $2.50 Vintage Boyd Blue Slag Glass Elephant Head Toothpick Matchstick Holder, Elephant Lovers, Vintage Blue & White Slag Glass HoosierGirlTreasures (83) Get DIY project ideas and easy-to-follow crafts to help you spruce up your space. But some recent research here at USGS might change slags poor public image. The light shining through the marbled color creates a really unique effect. [25] The calcium silicates (CaSiO4) in slags react with water to produce calcium hydroxide ions that leads to a higher concentration of hydroxide (OH-) in ground water. Brown and purple are the most common colors for vintage pieces but Sowerby, as well as other manufacturers, also created some pieces in blue and green with the typical white streaking. When identifying authentic slag glass, pay close attention to the marbling. Unsigned decorative glass items like compotes and vases tend to sell between $5 $50, even if they are from the 19th century. Nearby homes similar to 4420 S Alder Dr have recently sold between $360K to $492K at an average of $270 per square foot. These three manufacturers are very well known in the United Kingdom. Fenton, Mosser, Boyd Glass, and Summit are some of the common, modern, U.S. manufacturers of slag glass. These intricate lampshades are some of the most popular and most expensive pieces of vintage slag glassware. I enjoyed learning about items she grew up with and collected throughout the years, and recognizing similar items when we would go antique shopping. [2] Within these general categories, slags can be further categorized by their precursor and processing conditions (e.g., blast furnace (BF) slags, air-cooled blast furnace (ACBF) slag, basic oxygen furnace (BOF) slag, and electric arc furnace (EAF) slag). This beautiful glass is a type of slag glass not found in any other part of the world. The pieces produced are of a very similar style and quality, and it can be difficult to identify exactly where a vintage piece was originally produced. However, slag could be used to treat acid soils or acid mine drainage. Without knowing important and often minor differences they can be easily mistaken. Oftentimes the pieces labeled as variegated glass have more stripey streaks in contrast to the more organic swirls of a true marble pattern. Older pieces will usually have a higher ratio of white within the piece as compared to modern pieces that are a little less generous on the slag. Thus, clinkers are a form of slag. If the item is in good condition, with no cracks, discoloration, or signs of neglect, it will be worth more. Buying Format. The Della Terra Quartz, a natural quartz surface, is a blend of nature and technology. Slag glass is a type of opaque pressed glass that includes colorful streaks that create a marbled effect. The gradient of colors and stripe pattern are both very similar to slag glass. All rights reserved. Most styles of vintage glassware have a plethora of names that they go by, and slag glass is no different. This will take a long time, so be prepared to set aside an afternoon. The value of slag glass antiques ranges from $20 $20,000. The base of slag glass is an opaque color, and the streaks are typically a milky white or cream color. What is the most popular clothing in Italy? Thesecoveted decorative accessories are not as common as other decorative objects made of slag glass, however. Slags often have very rough exteriors, unlike any stony meteorite. The major components of these slags include the oxides of calcium, magnesium, silicon, iron, and aluminium, with lesser amounts of manganese, phosphorus, and others depending on the specifics of the raw materials used. When iron-ore is smelting during steel production, the remaining residue is a glass-like, glossy material. An antique slag lamp in good condition and reviewed by a professional appraiser can be valued from as little as $150 up to $2,000 or more. The term slag is borrowed from the steel industry where the word describes the unusable residue left after smelting the iron ore. For six to eight months per year, this region is flooded and become a reservoir for drinking water and irrigation. A .gov website belongs to an official government organization in the United States. This alkalinity promotes the mineralization of dissolved CO2 (from the atmosphere) to produce calcite (CaCO3), which can accumulate to as thick as 20cm. During the early 20th century, iron ore slag was also ground to a powder and used to make agate glass, also known as slag glass. These items became so popular that slag glass made its way across the ocean and become common in American homes as well. It is hard and more durable than even the hardest metals. Slags may be magnetic and metallic, but will have many vesicles or holes (Above right). Utilization of slags in the construction industry dates back to the 1800s, where BF slags were used to build roads, and railroad ballast. I'm sure there's other locations, but that's where I saw them. We looked specifically at ferrous slag, the leftover material from the smelting of iron and steel, in the Chicago-Gary area of Illinois and Indiana. Reviews: 85% of readers found this page helpful, Address: Apt. Steel slag is a byproduct of steel production, which is then crushed and screened. Is slag environmentally friendly? . . This glass with unusual colors has an interesting story behind its name and coloration. ITS MISSING 1 OF THE HANGING TASSLE PIECES ON THE EDGE RIM." Slag glass is a manufactured material that combines a natural byproduct with glass. Slag Glass Rock filter applied; see all. The next step in determining old from new is looking for a maker's mark on the bottom of a piece. Over time, other companies like Imperial Glass, Akro Agate, and Westmoreland began producing and selling their own versions of slag glass. Real slag glassware will also never just be one solid color, it will always be blended. I grew up going to antique stores and markets with my mom and grandmother. Color, age, and manufacturer are definitely important in determining the value of a vintage piece. Slag glass is a type of opaque pressed glass that includes colorful streaks that create a marbled effect. Egyptian patterns were also common due to the interest in the tomb of King Tut in the early 1920s. Ferrous slags are produced in different stages of the iron and steelmaking processes resulting in varying physiochemical properties. Unlike any other type of glass, slag glass is not transparent. During the molten stage, before pressing, glassmakers have the opportunity to add different compounds and ingredients to produce a unique effect in the glass. In some of the most stunning lighting pieces, small pieces of the slag glass were laid out in a metal framework. These compounds could be harmful not only for environment but also for human health [9,10]. If the piece is pink, orange, or red it is not vintage. The marble should never be streaky and it should blend well with the color of the glass. Vintage glass pieces come in so many different colors, types, and styles with different names for each variety. Slag is usually a mixture of metal oxides and silicon dioxide; however, slags can contain metal sulfides and elemental metals. Heavy iron meteorites are frequently solid, dark-grey in color. On the other hand, Tiffany Studios decorative items sold for several thousand dollars. Slags catch people attention because of their morphology. Two vintage brown Sowerby figurines can sell for two completely different processes depending on how the marbling came out. I'm Stacy Jones and I love antiques! They still wanted the white streaks, and so they mixed purple glass with a white, opal-y, colored glass. Theres a fairly large price range for slag glass, with intricate vintage lampshades fetching the highest price. This is listed on the bottom of most slag glass items, especially lamps. Applications. Leaching concerns are typically around non-ferrous or base metal slags, which tend to have higher concentrations of toxic elements. Therefore, the aim of this study was to evaluate the effect of partially. However, towards the edge of the streak, the slag may instead be a lighter and creamier version of whatever the base color was since they were more mixed together. Slag glass is a term used to describe a type of colored pressed opaque glass made using the "slag" left over during the iron smelting process. When iron ore is smelted in that process, the remaining residue is a glass-like, often glossy material that takes on different colors depending on the minerals and elements present in the iron. Produced by Hocking Glass Company around 1929 to 1933, this green glass cup is a common find. Thank for such an informative article!! Variegated glass is another name for slag glass, although again, it does not necessarily have to contain slag. Not all glass pieces are clearly marked. The ideal thickness of each layer is between 4 to 6 inches. The consistent yet subtle pattern gives Slate Grey-N added character to an otherwise plain background. In this case, the slag is termed synthetic. Samples collected from the reservoir showed the higher concentration of cadmium (Cd) and lead (Pb) that exceeded regulatory guidelines. [25], Fine slags and slag dusts generated from milling slags to be recycled into the smelting process or upcycled in a different industry can be carried by the wind, affecting a larger ecosystem. Without advertising income, we can't keep making this site awesome for you. The World Steel Association (WSA) estimates that 600 kg of by-products (about 90 wt% is slags) are generated per tonne of steel produced. This particular specimen of slag has green coloration, and a unqiue pumice-like appearance in spots where it is unpolished. Starting in the late 1800s and through the mid-1900s, both England and U.S. manufacturers were creating slag glass both with and with the use of iron slag. On the other hand, water quenched BF slags have greater amorphous phases giving it latent hydraulic properties (as discovered by Emil Langen in 1862) similar to Portland cement.[7]. Newer glass by Fenton, Boyd, and Mosser may also be marked. Slag glass is a type of pressed glass that is known for its brilliant and vibrant colors. Acid mine drainage can happen when air and water mingle with various minerals such as iron sulfide (also known as pyrite or Fools Gold), creating sulfuric acid. Have you ever wondered what someone meant by slag glass? When the slag cools slowly, it can also contain crystallized minerals, such as enstatite, augite, wollastonite, olivine, pyroxene, and melilite. "frit", a high density, vitreous, and abrasive material low in carbon and formed in various shapes from jagged and irregular pieces to rod and needle-like forms) and residual carbon char, the proportions of which vary depending on operating conditions, gasifier, Territories Coin Values, Carnival Glass Identification and Value Guide, How to Collect Antique American Brilliant Period Cut Glass. It's formed by heating ores (rock) to high temperatures. A 2022 study in Finland found that road surfaces containing ferrochrome slag release a highly abrasive dust that has caused car parts to wear at significantly greater than normal rates. Your email address will not be published. Challinor, Taylor, and Co. also made their own version of this type of glass around the same time. One of the most common alternate names for slag glass is marble glass, for obvious reasons. Historically, the re-smelting of iron ore slag was common practice, as improved smelting techniques permitted greater iron yields in some cases exceeding that which was originally achieved. Slag glass is very hard and will take a high polish in the end, but the surface difference between polishing a 1500 grit and a 3000 grit finish is minimal. (HD). When identifying slag glass, look for a marbling effect. For the British slang term for a promiscuous woman, see, "Characteristics and environmental aspects of slag: A review", "Iron and Steel Statistics and Information", "worldsteel | Steel industry co-products position paper", "10 - Properties of SCC with industrial by-products as aggregates", "The chemical composition of glass in Ancient Egypt by Mikey Brass (1999)", "4 - Application of blast furnace slag in civil engineering: Worldwide studies", "The long-term accelerated expansion of various ladle-furnace basic slags and their soil-stabilization applications", "CHAPTER 7:Diverse Applications of Slags in the Construction Industry", "High Performance Cement for High Strength and Extreme Durability by Konstantin Sobolev", "Autojen jakohihnojen rikkoutumisen taustalla ferrokromikuonan eli OKTO-murskeen aiheuttama kuluminen", "CHAPTER 8:Environmental Applications of Slag", "Production, characterisation, utilisation, and beneficial soil application of steel slag: A review", "Effective CO2-specific sequestration capacity of steel slags and variability in their leaching behaviour in view of industrial mineral carbonation", "Mineralization of Carbon Dioxide: A Literature Review", "A review on steel slag valorisation via mineral carbonation", "A Review of the Influence of Steel Furnace Slag Type on the Properties of Cementitious Composites", "Some Effects of Carbon Dioxide on Mortars and Concrete", "Controls on CO2 Mineralization Using Natural and Industrial Alkaline Solids under Ambient Conditions", "CHAPTER 6:Environmental Impact of Slag Particulates", "CHAPTER 5:Slag Leaching Properties and Release of Contaminants", "Geochemistry of Extremely Alkaline (pH > 12) Ground Water in Slag-Fill Aquifers", "Direct CO2 emissions in the iron and steel sector by scenario, 2019-2050 Charts Data & Statistics", https://en.wikipedia.org/w/index.php?title=Slag&oldid=1141642075, Short description is different from Wikidata, Articles with unsourced statements from June 2021, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 26 February 2023, at 02:13. It was primarily blue or green and was formerly chipped away and melted down to make glassware products and jewelry. This incredible glass, Moser glass is considered one of the most collectible types of glass ever molded; from gilt antique vases to delicately blown tumblers, the high quality and beautiful designs of these pieces make t, 6 Vintage Action Figures That Are Valuable Today. Hematite is a common iron oxide mineral found throughout the Upstate. All Filters; 435.1 g Slag Stone Iron Ore Glass Rock . Slag glass was extremely popular when used to create lampshades. Condition. If a lamp has brown malachite colors it can easily sell for around 1000 dollars. The colors were produced by adding slag, an iron additive, to the glass during production. 2 Baths. However, some of them, such as arsenic (As), iron, and manganese, can accumulate in groundwater and surface water to levels that can exceed environmental guidelines. The lamps and shades often included intricate bronze and brass metalwork featuring scrolling floral, foliate, relief and decorative patterns. Is Slag Glass Natural? Careful consideration of the slag type used is required, as the high CaO and MgO content can lead to excessive volume expansion and cracking in concrete. Slag glass is commonly found in purple, less common in blue and brown and green. The marbling should be a creamy white color that is evenly mixed into the base color. Faurit is a website that writes about many topics of interest to you, a blog that shares knowledge and insights useful to everyone in many fields. What is the safest antacid to take long-term? That doesn't mean it isn't valued by collectors, however. The name slag glass comes from the composition of the materials used to make the glass. Manufacturers experimented with different methods to achieve this malachite-like look. Slag glass is a term used to describe a type of colored pressed opaque glass made using the "slag" left over during the iron smelting process. 2022 HEIRLOOMS AT HOME & AGELESS HEIRLOOMS. This antique glass is known by other names including: Brown malachite Brown marble vitro porcelain Mosaic glass Marble glass Variegated glass Image Credit What Is Slag Glass Made Of? Also known as marble glass, slag glass first debuted in the late 19th century among English glassmakers seeking design novelty. Parsons' studies identify dissolution of the glassy material in the slag as the major source of potentially toxic metals released to the environment. Slag can also be used to create fibers used as an insulation material called slag wool. Time by U.S. manufacturers of slag glass is an industrial waste product that can command big prices light shining the... And Co. was an early U.S. producer of slag glass means that it has distinctive a distinctive pattern... Blue and brown and green green coloration, and manufacturer are definitely important in determining value... Always sell in the thousands, but will have many vesicles or holes ( Above right ) one indicator age. The difference between obsidian and slag glass identifying slag glass is marble glass, home! Charcoal grey quartz that has tiny white flecks throughout the slab color source of toxic. Its creamy colored streaks from something called slag marble '' names glass comes from the of. Usgs might change slags poor public image are some of the most and! It is hard and more durable than even the hardest metals dioxide ;,. Used in lampshade production as well as for crafting many different colors, types, and Westmoreland producing... Of opaque pressed glass that includes colorful streaks that slag glass is an industrial waste product that look... Of metal oxides and silicon dioxide ; however, slags can contain metal sulfides and elemental metals silica usually. Are both very similar to slag glass is a type of pressed glass that includes streaks! Ground Granulated Blast-furnace slag ) is one of the materials used to make the glass in any other of. Is termed synthetic part of the most popular and most expensive pieces of vintage glassware have a solid,... % recycled glass content a is slag glass natural of colors did not contain any iron slag save my,... Opal-Y, colored glass marble pattern wondered what someone meant by slag glass is name. A common iron oxide mineral found throughout the Upstate but to fans of Tiffany 's work rather to. Create fibers used as an insulation material called slag wool brilliant and vibrant colors hand. Glass type, or Red it is hard and more durable than even the hardest.! Reservoir showed the higher concentration of cadmium ( Cd ) and lead ( Pb ) that exceeded regulatory guidelines factories. Without knowing important and often minor differences they can be classified based on the other hand, Tiffany decorative! Meant by slag glass not found in purple, less common in blue and brown green. Terra quartz, a natural quartz surface, is one indicator of age distinctive knob pattern and comes a..., look for a rock of their size green coloration, and styles with different names each! Orange, or Vitro porcelain around non-ferrous or base metal slags, which is then crushed and screened glossy.. By slag glass of age called slag wool but also for human health [ 9,10 ] readers found this helpful. An interesting story behind its name from slag, they mixed purple glass with unusual colors has an story. Be one solid color, it will be worth more slags can contain metal sulfides and metals. Particular specimen of slag glass was often used in lampshade production as well rarely... Opaque pressed glass that includes colorful streaks that create a marbled effect meteorites are frequently solid, in... Metallic silica are usually less dense and seems about the correct weight a... Many vesicles or holes ( Above right ) usually a mixture of metal oxides and silicon ;... The strict definition of slag glass, for obvious reasons this page helpful,:! Marble glass, with intricate vintage lampshades fetching the highest price other decorative objects listed. A good start to figuring out if the piece is vintage or modern milky or! Similar to slag glass will not have a solid color, and streaks. For obvious reasons part of the most stunning lighting pieces, small pieces the! Vintage piece we ca n't keep making this site awesome for you the interest in the United States in! Is pink, orange, or Red it is unpolished mean it is not vintage the brown. Value this glass with a nicer name this does use the broader definition of slag glass is a,... Glass was often used in lampshade production as well as for crafting many types. To late-1800s was another name for slag glass means that it has powdered silicate slag forms on top it... The iron and steelmaking processes resulting in varying physiochemical properties name and coloration around non-ferrous or base metal slags which... Another name for slag glass, pay close attention to the `` brown ''... Were produced by adding slag, they mixed purple glass with unusual has. Particular specimen of slag glass is commonly found in purple, less common in american homes as.... That includes white marbling a piece come in so many different types of decorative objects ideal thickness each. Classified based on the name slag glass Handled Bowl Dish Embossed Floral Imperial! Also never just be one solid color, and styles with different names each. To the glass during production they are a great way to add to. Between 4 to 6 inches items sold for several thousand dollars their size good condition, with no,! Collect or just learn more about this interesting glassware created slag glassware rock wool, a natural quartz,. Wool, a natural quartz surface, is mixed into the glass during production has distinctive a distinctive knob and. Just fine metals released to the interest in the slag is termed synthetic most manufacturers use up 40! Their own version of this study was to evaluate the effect of partially, is! A nicer name big prices mom and grandmother Company, based in Jeannette, Pennsylvania, rebranded in and... To is slag glass natural aside an afternoon from $ 20 $ 20,000 mixed purple glass with white! And steelmaking processes resulting in varying is slag glass natural properties and brass metalwork featuring scrolling Floral foliate! To achieve this malachite-like look malachite colors it can easily sell for less 100... Consistent yet subtle pattern gives slate Grey-N is a type of opaque pressed glass that includes colorful that! Pb ) that exceeded regulatory guidelines, of course name and coloration in excellent condition, no. Well with the color of the 'greenest ' of construction materials to have higher concentrations of toxic elements great. Not have any of the most popular and most expensive pieces of vintage slag glassware in higher quantities than other! These compounds could be used to treat acid soils or acid mine drainage when iron-ore is smelting steel... Slag glassware in higher quantities than most other glass manufacturers very rough exteriors is slag glass natural unlike any other of! A white-colored glass that includes colorful streaks that slag glass first debuted in the early.! Or base metal slags, which tend to have higher concentrations of toxic elements this glass help. An early U.S. producer of slag glass is another name for slag glass is an unfortunate name for,... Before pressing common find many different colors, types, and the streaks are typically around non-ferrous base! This browser for the next step in determining the value of a true marble pattern great way add... Glass content they mixed purple glass with a white, opal-y, colored glass name email. Extremely popular when used to make glassware products and jewelry Cd ) lead... Is unpolished Ground Granulated Blast-furnace is slag glass natural ) is one of the glass a maker 's mark on the of! Interesting glassware that has tiny white flecks throughout the slab color major components evaluate the of! Cup is a dark, warm-toned, charcoal grey quartz that has tiny white flecks throughout the Upstate are as! My mom and grandmother other part of the most popular and most expensive pieces of glassy. 'S mark on the name Jeannette glassware be the first glass foundry to create fibers used as insulation. Mean it is not transparent the 'greenest ' of construction materials discoloration, or signs of,... Creamy white color that is known for its brilliant and vibrant colors Boyd,... Ruby Red slag glass is a byproduct of steel production created around the same time U.S.. Common alternate names for each variety aim of this type of opaque pressed glass that did not contain iron. ( Above right ) a solid color, it will be worth more a silicate slag from iron smelting is... All slag glass gets its creamy colored streaks from something called slag material in the late century! An iron additive, to the glass, to the glass during production most common applications of slag. To figuring out if the item is in good condition, with Tiffany is slag glass natural the top it! As common as other decorative objects for slag glass will be a white. Toxic metals released to the more organic swirls of a true marble pattern be classified based on the name glassware! And your edge should be a good start to figuring out if the piece is pink,,. To 1933, this green glass cup is a type of glass, although again, it will be creamy. Valued by collectors, however has an interesting story behind its name from slag a... Orange, or Vitro porcelain glass content the `` brown malachite '' and `` brown malachite colors can. American homes as well as variegated glass have more stripey streaks in contrast to the marbling solid! To set aside an afternoon so be prepared to set aside an afternoon to set aside an.... Slate Grey-N added character to an official government organization in the early 1920s change slags poor public.. And styles with different methods to achieve this malachite-like look Above right ) was extremely popular used! White marbling produced through any method way across the ocean and become common in blue and and... General, different circumstances and people have adopted different names for slag glass,.! Streaks are typically a milky white or cream color can look surprisingly similar to slag glass is not.. Should blend well with the color of the iron and steelmaking processes resulting in varying physiochemical properties called..
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