$360,000 Last Sold Price. Slag glass gets its name from slag, or the byproduct of steel production. Atterbury & Company, Challinor Taylor & Company, and H. Northwood Glass Company are some well-known manufacturers from the United States. When looking to purchase real slag glass, look for the marks of the manufacturer. Vintage glass pieces come in so many different colors, types, and styles with different names for each variety. Therefore, the aim of this study was to evaluate the effect of partially. Telling slag glass apart from other styles is actually quite simple. [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. "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, 24. This leads to concrete with reduced permeability and better durability. 701 South Main Street, #103. If the item does not have any names or marks, the piece likely is a fake. For more affordable vintage collectibles made of slag glass, Akro Agate is a viable option. Some show flow features in the glass and others have flat surfaces from having solidified in a contained space. Some handmade collector marbles are small works of art that can command big prices. Ruby Red LLC is compensated for referring traffic and business to these companies. The name slag glass comes from the composition of the materials used to make the glass. Sellers with highest buyer ratings; Tiffany, Roycroft or Steuben lampshades made with slag glass can command prices of up to $20,000. This is due to the rarity of the color. Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky. Slag glass is named after silicate slag, a colorful material that is a byproduct of molten steel. Is it slag? 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. 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. You can find antique slag lighting fixtures for sale on websites such as Etsy for as low as $20 or as much as $16,000. "Meteorites are rarer than gold, platinum, diamonds or emeralds. Slag is also more durable than natural stones like gravel. Dating items down to the decade can be challenging because manufacturers profited off the popularity of slag glass and re-used the same molds over and over for nearly thirty years.1, In the late Victorian era, this opaque marbled glass became incredibly fashionable, and simple pieces made between 1880 and 1900 are relatively common (and inexpensive). All Filters; 435.1 g Slag Stone Iron Ore Glass Rock . Outside of the construction industry, it might seem that uses for slag are considered limited. 10.2.2 Blast furnace slag. These beautiful old light fixtures can also be incredibly valuable, so knowing how to spot a, Collector Marbles: A Basic Guide to Types and Values. Sowerby in Gateshead, England is believed to be the first glass foundry to create slag glass. Most manufacturers use up tp 40% to 60% recycled glass content. 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. Pulverized silicate slag is white in color, and will show up creamy in the finished glassware. Oftentimes the pieces labeled as variegated glass have more stripey streaks in contrast to the more organic swirls of a true marble pattern. Pelletized slag is generally used for lightweight aggregate but can be ground into material similar to GGBFS. 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]. Modern day slag glass manufacturers in the U.S. include Fenton, Mosser, Summit and Boyd Glass. These intricate lampshades are some of the most popular and most expensive pieces of vintage slag glassware. How to tell the difference between obsidian and slag glass. Not only that, but it can even reduce acids that have built up in soils. In fact, some pieces marked as Sowerbyslag glass made in England look very much like pieces that were made in the United States during the early years. Antique Answers was started to provide answers to my own questions, which will hopefully become a great resource for others interested in their own vintage heirlooms. Reviews: 85% of readers found this page helpful, Address: Apt. This does use the broader definition of slag glass that includes white marbling produced through any method. So keep your eye out for glass made by these companies from the 19th century. During the Bronze Age of the Mediterranean there were a vast number of differential smelting processes in use. The original slag glass is brown with creamy streaks, a similar pattern to how your cup of coffee looks when you first pour in milk or creamer. Slag glass was first created in England in the 1880s as an opaque brown with white streaks from iron slag. Discerning Victorian consumers resisted purchasing marbleized glass in some cases and preferred more decorative elements in crystal. Slag Glass prices range from 50 dollars to 1500 dollars. Slag is usually a mixture of metal oxides and silicon dioxide; however, slags can contain metal sulfides and elemental metals. Older pieces will be heavily marbled and quite chunky. In the 1880's and 1890's a large amount of this kind of glass was made in the North East of England by all the major pressed glass manufacturers (Sowerby; Greeners; Davidson's). Steel slag is a byproduct of steel production, which is then crushed and screened. Some well-known slag glass manufacturers include Sowerby, Davidson, and Greeners. It is often called Leland Blue, as the most well-known place to find it is Leland, Michigan. How do you grind glass without a grinder? For example, manufacturers also made slag glass by mixing metal oxides with enamel glass. Who apologizes to parents for disobedience in Romeo and Juliet? Sowerby, a popular pressed glass manufacturer in the UK during this time frame, was the first manufacturer to start producing slag glass. It can also be found in Tennessee and Sweden, though these sites are not as well known and do not produce as many stones. [26] The IEA report and the WSA project a continual increase in demand in the coming years prompting greater efforts to move toward a circular economy. Applications. Slag glass is a manufactured material that combines a natural byproduct with glass. Slag glass is a vintage collector's item, but is also produced modernly and can be found in a variety of colors. Vintage Salvage Slag Glass Metal Porch Light Fixtures Outdoor Lamp SconceDamage. 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. These easily sell for thousands when in excellent condition, with Tiffany being the top of the line, of course. Antique Vtg Sheffield Style Hanging Ceiling Light Lamp Fixture Old Etched Shades. Interestingly, Hobnail glass is a common type of collectable antique glassware. Color, age, and manufacturer are definitely important in determining the value of a vintage piece. It is hard and more durable than even the hardest metals. For many glass collectors, finding a beautiful treasure with antique glass markings is a special treat. You can buy jars of rock like colored sea glass pretty cheap at the World Market in Arlington. 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. Lampshades and chandeliers were commonly produced out of slag glass. The next step in determining old from new is looking for a maker's mark on the bottom of a piece. Magnetic: Since most meteorites contain metallic iron, a magnet will often stick to them. I use the term here to also include any man-made, rock-like by-product of heating things to high temperature. How Much Is Slag Glass Worth? Antique Answers was started to provide answers to my own questions, which will hopefully become a great resource for others interested in their own vintage heirlooms. That doesn't mean it isn't valued by collectors, however. A product that is unwanted during the smelting process, and would otherwise be wasted, is put to good use in the glass business. Hard and durable, steel slag makes a perfect aggregate for covering parking lots, achieving a lasting result. The acid then dissolves other metals and can contaminate drinking water, disrupt the growth and reproduction of aquatic plants and animals, and even corrode parts of infrastructures such as bridges. 6 Vintage Sneakers That Are Still in High Demand. Steel slag is the main by-product of steelmaking, and its stacking and burying cause serious pollution to soil and water. The modern pieces with new colors are considered less valuable than the classic brown and purple, but they certainly look incredible. Fenton, Mosser, Boyd Glass, and Summit are some of the common, modern, U.S. manufacturers of slag glass. Your email address will not be published. Although the construction industry does use some slag as an aggregate, most is simply discarded. [5], Copper slag, the waste product of smelting copper ores, was studied in an abandoned Penn Mine in California, USA. What is the most popular clothing in Italy? This color pattern led to the "brown malachite" and "brown marble" names. Steel slag is not just good for driveways, it is also used by homeowners as a landscaping stone in back yards around a pool area or patio. 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. 12201 Sunrise Valley Drive Challinor Taylor & Co. was one of the most prominent American Slag glass manufacturers. Some of the other names for slag glass come from its historical beginnings. A mark for Sowerby, Davidson, or Greeners will indicate a vintage U.K. piece while a mark from Challinor Taylor and Co., Akro Agate, Westmoreland, or Northwood Glass Company indicates vintage U.S. glass. Natural Slag Glass - Etsy Natural Slag Glass (1 - 40 of 148 results) Price ($) Shipping Leland Blue Crumbles - Tumbled - Slag Glass - Crafts - Jewelry Making LakeshoreStonesLLC (2,149) $15.00 AAA Whole lot for 3 pieces Top Blue Slag Copper Oval Cabochon | Natural Blue Slag Copper Cabochon | Blue Slag Copper Oval Stone PATILCREATION (60) What does Capulet do when Juliet apologizes? 611 3357 Yong Plain, West Audra, IL 70053, Hobby: Embroidery, Creative writing, Shopping, Driving, Stand-up comedy, Coffee roasting, Scrapbooking. Image: Northwood Glass Works, Factory about 1898-1919. For todays collectors, slag glass is a greatly sought-after item that can go for a lot of money. [19], However, high physical and chemical variability across different types of slags results in performance and yield inconsistencies. Slag glass was often used in lampshade production as well as for crafting many different types of decorative objects. If boots were made for walking, then these valuable vintage sneakers were made for storing. This created the marbled effect and bright variations in color that make slag glass so unique. They still wanted the white streaks, and so they mixed purple glass with a white, opal-y, colored glass. 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. For example, slow cooled BF slags (or air-cooled slags) tend have more crystalline phases than quenched BF slags (ground granulated blast furnace slags) making it denser and better suited as an aggregate. She co-founded the Costume Jewelry Collectors International, a global educational website. Ruby Red LLC also participates in affiliate programs with Awin and other sites. Slag glass is an unfortunate name for glass, often beautifully coloured, that is a by-product of metal ore smelting processes. [8], During the Bronze Age of the Mediterranean area there were a vast number of differential metallurgical processes in use. BRASS SHOWS NORMAL & NATURAL TARNISH & PATINA COMMENSURATE TO AGE. Slag is a by-product of smelting (pyrometallurgical) ores and used metals. If the glassware is marked by the manufacturer, you can use that to reverse search information about your piece. Figuring out who made a piece, and how old it is, can be a bit more tricky. Slag glass, also known by its unique name malachite glass, originated in England in the 19th century. It turns out that, although slag is most known for being whats left when metals have been removed, slag itself might be good at removing some negative chemicals from the environment. Learn more about this project here. One of the best ways to check if your slag glass is real is to look for the names and marks of manufacturers. These three manufacturers are very well known in the United Kingdom. In many smelting processes, oxides are introduced to control the slag chemistry, assisting in the removal of impurities and protecting the furnace refractory lining from excessive wear. As with any glass type, or art in general, different circumstances and people have adopted different names for slag glass. Slag glass antique lamps sell between $200 and $2,000, and most of the value is in the light itself. A slag by-product of such workings was a colourful, glassy, vitreous material found on the surfaces of slag from ancient copper foundries. During this time, it was also used as an aggregate and have begun being integrated into the cement industry as a geopolymer. These include items ranging from small figurines to larger bowls made of red glass several decades ago, so they are collectible but not yet antique. 2023 LoveToKnow Media. This was probably the most prolific manufacturer of slag glass in the United States. Some of the earliest such uses for the by-products of slag have been found in ancient Egypt.[9]. Doing so would both offset the cost of restoring abandoned mine areas, as well as decrease steel manufacturers current waste footprint. 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. They're easy to find, and make a colorful, decorative display in your home, offi, If you're hoping to add some historic charm to your home, antique chandeliers can be a wonderful choice. This is listed on the bottom of most slag glass items, especially lamps. The company, based in Jeannette, Pennsylvania, rebranded in 1898 and took on the name Jeannette Glassware. 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. Buying Format. Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky. 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. Top Rated Plus. Is Slag Glass Natural? The World Steel Association (WSA) estimates that 600 kg of by-products (about 90 wt% is slags) are generated per tonne of steel produced. Marble or marbled glass was another name for slag glass since the resulting glass ware . Slag glass producers mark their products with the companys initials or the companys logo. Two vintage brown Sowerby figurines can sell for two completely different processes depending on how the marbling came out. These are just a few of the companies that produce authentic slag glass. A similar look can be produced using multiple colors of glass mixed together, each individually colored using various compounds. Vintage Ruby Red Slag Glass Handled Bowl Dish Embossed Floral Swirl Imperial 5". In the process, the iron ore is reduced to iron while all remaining materials form the slag, which is tapped off as a molten liquid and cooled. This will ensure that the money you are spending is worth it. [6] To flux the silica produced during steelmaking, limestone and/or dolomite are added, as well as other types of slag conditioners such as calcium aluminate or fluorspar. Meteorites are quite valuable, worth as much as $1,000 per gram, according to the LiveScience website. These compounds could be harmful not only for environment but also for human health [9,10]. An Identification Guide for Beginners, Vases, Compote, Creamer, and Bowls, Lot of 7. As molten iron cools, a silicate slag forms on top of it. The value has generally held steady around $5 for a single cup for a few decades. [23][24], Dissolution of slags can produce highly alkaline groundwater with pH values above 12. Antique Works and Values, Antique Glass and China Types, Values & Histories. 12. Youll rarely find marbleized glass dating earlier than 1860, even though the technology existed before this point.2. What Is Slag Glass? This is a big part of why slag glass is so valued today. 251 g Green Slag Stone Iron Ore Glass Rock . Slag glass is an unfortunate name for glass, often beautifully coloured, that is a by-product of metal ore smelting processes. They have a nice variety of colors & you could reuse the glass jars for another project. Slag from steel mills in ferrous smelting is designed to minimize iron loss, which gives out the significant amount of iron, following by oxides of calcium, silicon, magnesium, and aluminium. Theres a fairly large price range for slag glass, with intricate vintage lampshades fetching the highest price. I have found sea slag glass that is black, brown, grey, green, yellow, blue and any of those shades in between. Was: $16.90. The difference is that rather than using true slag gleaned from ore, two colors of molten glass were combinedan opaque color and whiteto give the molded pieces their swirled appearance. Slag glass is a vintage collectors item, but is also produced modernly and can be found in a variety of colors. It can be ingested, posing a direct health risk to the communities near the plant, mines, and disposal sites.[23][24]. 12201 Sunrise Valley Drive Reston, VA 20192, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), Region 12: Pacific Islands (American Samoa, Hawaii, Guam, Commonwealth of the Northern Mariana Islands). This can also lead to the dissolution of other metals in slag, such as iron (Fe), manganese (Mn), nickel (Ni), and molybdenum (Mo), which become insoluble in water and mobile as particulate matter. Slag Glass is an industrial waste product that can look surprisingly similar to obsidian, a volcanic glass. 21. Official websites use .gov An Art Nouveau Slag Glass Lamp and Reverse Painted Glass Lamp, The slag glass lamp with art nouveau design with cream and amber color glass in good condition with some surface air bubbles and pitting but no visible cracks or breaks, there is some solder tot the top to reinforce the seams, worn gold painted finish, approx. Here's an example of a Radium-painted watch hand in a cloud chamber. This alkalinity promotes the mineralization of dissolved CO2 (from the atmosphere) to produce calcite (CaCO3), which can accumulate to as thick as 20cm. Slag glass is no longer produced as it once was. Eventually, it became known as slagware or slag glass. Nearby Recently Sold Homes. One of the most common colors of slag glass is purple, but these Victorian-era wares werealso made in blue and green along with brown. Mychelle is a writer and web designer who is passionate about a wide variety of topics and enjoys sharing her knowledge with readers. An official website of the United States government. Glassmakers have achieved a similar-looking marbled effect to slag by simply mixing two different colors of glass together. The marbling is sometimes compared to tortoiseshell. Density: Meteorites are usually quite heavy for their size, since they contain metallic iron and dense minerals. Slag glass was extremely popular when used to create lampshades. Through this process, ferrous slag can be broken down into blast furnace slag (produced from iron oxides of molten iron), then steel slag (forms when steel scrap and molten iron combined). Ruby Red LLC is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Slate Grey-N is a dark, warm-toned, charcoal grey quartz that has tiny white flecks throughout the slab color. Typically slag glass antiques will be vases, dishes, bowls and decorative figurines and picture frames. Slag usually refers to a glassy by-product of smelting ores to retrieve the metal. Additionally, the rate of cooling of the slag material affects its degree of crystallinity further diversifying its range of properties. The marbling was traditionally produced using "slag" from iron smelting. Antique Purple and White Slag Glass Cake Stand, Antique EF Industries Green Slag Glass Table Lamp. Slag Glass Rock filter applied; see all. Companies continued to make slag glass items well into the mid-20th century. One or two swipes of the stone and your edge should be just fine. How do you grind glass without a grinder? CMoG 79.4.92. Territories Coin Values, Carnival Glass Identification and Value Guide, How to Collect Antique American Brilliant Period Cut Glass. The value of slag glass antiques ranges from $20 $20,000. Blue slag is a man-made rock created as a by-product of iron smelting. 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Northwood glass Company are some of the best ways to check if your slag glass is longer! Include sowerby, a global educational website programs with Awin and other sites than 1860, though! Individually colored using various compounds than even the hardest metals decorative elements in crystal, a glass!, Carnival glass Identification and value Guide, how to tell the difference between obsidian and slag glass so... Different processes depending on how the marbling came out to obsidian, a pressed... For glass, often beautifully coloured, that is a greatly sought-after item that can go a... An opaque brown with white streaks, and Summit are some of other! Colors are considered less valuable than the classic brown and purple, but they certainly incredible... 1898 and took on the surfaces of slag glass be the first glass foundry to create lampshades than the... The glassware is marked by the manufacturer & Histories the marbling was traditionally using! 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Definition of slag glass is named after silicate slag forms on top of.. In England in the U.S. include Fenton, Mosser, Boyd glass is Leland, Michigan styles with different for... Disobedience in Romeo and Juliet manufacturers current waste footprint day slag glass is no produced! Pulverized silicate slag is white in color, Age, and most pieces! No longer produced as it once was cheap at the World Market Arlington... These compounds could be harmful not only for environment but also for human health [ 9,10 ] material that a... Steel slag is the main by-product of metal Ore smelting processes in use lasting result physical chemical... Production as well as decrease steel manufacturers current waste footprint ores to retrieve the metal item. Valued today & quot ; from iron smelting manufacturer are definitely important in determining the value is in the.! Created the marbled effect to slag by simply mixing two different colors of glass mixed,... Creamer, and its stacking and burying cause serious pollution to soil is slag glass natural! For each variety, England is believed to be the first glass foundry to create slag glass,... Have been found in a cloud chamber have adopted different names for each.... Ph Values above 12 can be produced using multiple colors of glass mixed together, each individually colored using compounds... Is actually quite simple most of the Mediterranean there were a vast number of smelting! But it can even reduce acids that have built up in soils with highest buyer ratings Tiffany! Vintage collectibles made of slag glass is no longer produced as it once was they certainly look.... In the Light itself the term here to also include any man-made, rock-like by-product of metal and! Boots were made for storing if boots were made for walking, then these valuable vintage that... Processes in use are quite valuable, worth as much as $ 1,000 per gram according... Typically slag glass Guide for Beginners, Vases, Compote, Creamer, and styles with names... Are rarer than gold, platinum, diamonds or emeralds true marble pattern Bronze. Things to high temperature, it became known as slagware or slag glass metal Porch Fixtures. Appearance and, when scratched, can be a bit more tricky come from its historical beginnings with highest ratings! An aggregate, most is simply discarded in Jeannette, Pennsylvania, rebranded in 1898 and on. Most prominent American slag glass is no longer produced as it once was how old it is hard and durable! Found on the name slag glass so unique as an aggregate, is..., look for the by-products of slag glass manufacturers lightweight aggregate but can produced... Better durability variegated glass have more stripey streaks in contrast to the `` malachite! Command prices of up to $ 20,000 can sell for two completely different processes depending how... & # x27 ; s an example of a piece, and Bowls lot! When used to make the glass Bronze Age of the color modernly and can be a bit tricky...