Hi, I live in Israel and found two pieces of sea glass today that might be slag. True slag glass is marbled and has a variety of bright colors. Pulverized silicate slag is white in color, and will show up creamy in the finished glassware. She co-founded the Costume Jewelry Collectors International, a global educational website. "Meteorites are rarer than gold, platinum, diamonds or emeralds. Marble or marbled glass was another name for slag glass since the resulting glass ware . Also known as marble glass, slag glass first debuted in the late 19th century among English glassmakers seeking design novelty. Many of the same designs for milk glass were also produced in slag glass. All slag glass will be a marbled mix of some opaque color with opaque white. Antique Glass Insulators and Their Electrifying History, Antique glass insulators are a low cost but very popular collectible that come in a myriad of fun shapes and colors. Because . Some handmade collector marbles are small works of art that can command big prices. [19], However, high physical and chemical variability across different types of slags results in performance and yield inconsistencies. Recognizing slag glass is easy due to the distinctive coloration. Most antique slag items are brown, blue, green, or purple. Slag glass is the opaque pressed glass that has streaks of color within it. GGBFS react with portlandite (Ca(OH)2), which is formed during cement hydration, via the pozzolanic reaction to produce cementitious properties that primarily contribute to the later strength gain of concrete. In some of the most stunning lighting pieces, small pieces of the slag glass were laid out in a metal framework. [15], Because of the slowly released phosphate content in phosphorus-containing slag, and because of its liming effect, it is valued as fertilizer in gardens and farms in steel making areas. Manufacturers used the glass in molds to make bowls, compotes, vases, plant cache pots, and more. The highlights were often blue, turquoise, orange, brown, purple, and near black. Another way to determine if a piece is vintage or not is identifying the manufacturer and date, although that can also prove to be a difficult mission at times. 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. Iron meteorites are dense and therefore heavier for their size than most naturally-occurring rocks. Slag that has a low percentage of alumina to silica becomes glassier, and rapid cooling also makes it more glasslike. If you see a swirled piece in another color, like red or orange, it was made many decades after the first Victorian pieces of true slag glass. Slag glass is often used as a catch-all term for any type of pressed glass that is opaque and colorful, but not all glass that fits this description is true slag glass. Jeannette Glassware, originally Jeannette Bottle Works, was founded in 1888. Companies continued to make slag glass items well into the mid-20th century. Once you find those marks, research the company to see if they are an authentic brand. [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). 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. Antique Vtg Sheffield Style Hanging Ceiling Light Lamp Fixture Old Etched Shades. I'm Stacy Jones and I love antiques! In addition, slag glass panels were used in lamps, jewelry boxes, and other collectibles. This antique glass is known by other names including: Slag glass is created by using pulverized silicate slag, an ingredient that forms on the top of molten iron as it cools down. Real slag glassware will also never just be one solid color, it will always be blended. Telling the difference between streaks achieved by adding slag versus mixing in white-colored glass is a fairly difficult task best done by professional vintage glass evaluators. Figuring out who made a piece, and how old it is, can be a bit more tricky. 12. Some of the most costly slag glass pieces take the form of lampshades by well-known makers like Handel, Bradley Hubbard, and Tiffany. Slag. Traditional slag glass gets its creamy colored streaks from something called slag. These almost always sell in the thousands, but to fans of Tiffany's work rather than to glass collectors. Atterbury & Company, Challinor Taylor & Company, and H. Northwood Glass Company are some well-known manufacturers from the United States. Blueberry and cream were one of the first slag glasses founded by Gateshead who lived in England. 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. [5], In nature, iron, copper, lead, nickel, and other metals are found in impure states called ores, often oxidized and mixed in with silicates of other metals. Purple is the most common slag glass color. Though it's easily mistaken for other glass products produced around the same time period, such as stained glass, slag glass has its own unique look and slag glass items can fetch a wide range of prices. Egyptian patterns were also common due to the interest in the tomb of King Tut in the early 1920s. Other types of metal ores produce different colors of slag when they are refined. It has distinctive a distinctive knob pattern and comes in a variety of colors. The Della Terra Quartz, a natural quartz surface, is a blend of nature and technology. This will ensure that the money you are spending is worth it. Signed slag glass tends to be worth more than unmarked slag glass. If you love the look of slag but dont want to pay extra for vintage, or are looking for a higher variety of options, check out some of the more recently produced glass pieces. 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. These items are brown in color with swirls of white or cream within the glass. Slag is also used as aggregate in asphalt concrete for paving roads. If there are other, brightly-colored crystals or grains in the rock, it is probably not a meteorite, but many slag products do contain a variety of bright-colored crystals and fragments. Utilization of slags in the construction industry dates back to the 1800s, where BF slags were used to build roads, and railroad ballast. 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. Mar 18, 2020 6367. BRASS SHOWS NORMAL & NATURAL TARNISH & PATINA COMMENSURATE TO AGE. Secure .gov websites use HTTPS Many antique lamps of these periods were made with stained glass, rather than slag glass, and a careful review of the glass opacity and patterns is necessary to determine the difference. It can be difficult to distinguish from a photo between highly vitrified smelting slags and glass slag it is an artificial material largely composed of silica, though. This wouldnt be considered slag glass in the strict traditional definition, but many collectors will still use the term to refer to any marbled, opaque, pressed glass pieces. Slags may be magnetic and metallic, but will have many vesicles or holes (Above right). The term slag is borrowed from the steel industry where the word describes the unusable residue left after smelting the iron ore. Clinker is a glassy rock that often is found near these old foundries, a byproduct of burning coal. Slags catch people attention because of their morphology. By clicking Accept All Cookies, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. 2 Baths. Slag that has a low percentage of alumina to silica becomes glassier, and rapid cooling also makes it more glasslike. 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. Reston, VA 20192 Is it slag? Discerning Victorian consumers resisted purchasing marbleized glass in some cases and preferred more decorative elements in crystal. One of the uses for Blue Slag Glass is to help connect to higher energies and . Similarly, ferrous slags have been used as soil conditioners to rebalance soil pH and fertilizers as sources of calcium and magnesium. Density: Meteorites are usually quite heavy for their size, since they contain metallic iron and dense minerals. Vintage glass pieces come in so many different colors, types, and styles with different names for each variety. A similar look can be produced using multiple colors of glass mixed together, each individually colored using various compounds. This guide will explain how slag glass was made, when it was popular, and what its worth. Slags can serve other purposes, such as assisting in the temperature control of the smelting, and minimizing any re-oxidation of the final liquid metal product before the molten metal is removed from the furnace and used to make solid metal. One of the most common alternate names for slag glass is marble glass, for obvious reasons. Slag Glass Rock filter applied; see all. Slag glass is a vintage collector's item, but is also produced modernly and can be found in a variety of colors. Parsons' studies identify dissolution of the glassy material in the slag as the major source of potentially toxic metals released to the environment. When the slag cools slowly, it can also contain crystallized minerals, such as enstatite, augite, wollastonite, olivine, pyroxene, and melilite. However, the most important application is construction. I grew up going to antique stores and markets with my mom and grandmother. Some of Fenton's slag glass pieces can also be quite valuable, selling in the hundreds. Share sensitive information only on official, secure websites. The key identifying feature of this type of glass is its similarities to the patterning found in natural marble. There are three types of slag: ferrous, ferroalloy, non-ferrous slags, which are produced through different smelting processes. However, the popularity waned at times. Slag glass is no longer produced as it once was. 611 3357 Yong Plain, West Audra, IL 70053, Hobby: Embroidery, Creative writing, Shopping, Driving, Stand-up comedy, Coffee roasting, Scrapbooking. Thus, clinkers are a form of slag. Slag glass was originally created in the United Kingdom in the 1890s by adding this slag substance during the glass-making process. Slag (middle photo) is much lighter per unit volume than iron meteorites, and is frequently multicolored (blue, red and purple iridescence). Slag glass is a type of pressed glass that is known for its brilliant and vibrant colors. Save my name, email, and website in this browser for the next time I comment. Slag glass antique lamps sell between $200 and $2,000, and most of the value is in the light itself. The World Steel Association (WSA) estimates that 600 kg of by-products (about 90 wt% is slags) are generated per tonne of steel produced. She has also managed an online antiques community. It was also ground into powder to add to glazes for use in ceramics. There is another theory that slagware, and some other glass decorated with multi-colored enamels, were made up from odds-and-ends of glass left over at the end of the day, Webber reiterates.3, The most common base colors include white, cream, primrose, and blue. 1,572 Sq. How to tell the difference between obsidian and slag glass. Sowerby was a popular producer of this blackberries and cream slag look. The marbling was traditionally produced using "slag" from iron smelting. This byproduct can then be pulverized and used as a glass additive. (HD). I'm sure there's other locations, but that's where I saw them. When I am able to send you pictures, I would like to know your opinion on what it is and how old it might be. A lock () or https:// means youve safely connected to the .gov website. One or two swipes of the stone and your edge should be just fine. Challinor Taylor & Co. was one of the most prominent American Slag glass manufacturers. Slag glass was often used in lampshade production as well as for crafting many different types of decorative objects. Doing so would both offset the cost of restoring abandoned mine areas, as well as decrease steel manufacturers current waste footprint. 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. Slags often have very rough exteriors, unlike any stony meteorite. Antique Works and Values, Antique Glass and China Types, Values & Histories. 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. 3 Beds. 2002-2023 LoveToKnow Media. Malachite stones have wavy striping in a green-tinged milky white on top of a darker green. Slag glass is a type of pressed glass that is known for its brilliant and vibrant colors. Not only that, but it can even reduce acids that have built up in soils. Tiffany Studios also made objects such as picture frames, desk sets, and decorative boxes made with slag glass. Some of the most popular manufacturers were Miller, Bradley & Hubbard, Empire Lamp Manufacturing Company, Pittsburgh Lamp, Brass and Glass Company, H.E. Chemical variability across different types of slags results in performance and yield inconsistencies Works! 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