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Slag
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===Ancient uses=== During the [[Bronze Age]] of the [[Mediterranean]] area there were a vast number of differential metallurgical processes in use. A slag by-product of such workings was a colorful, glassy material found on the surfaces of slag from ancient copper foundries. It was primarily blue or green and was formerly chipped away and melted down to make glassware products and jewelry. It was also ground into powder to add to glazes for use in ceramics. Some of the earliest such uses for the by-products of slag have been found in ancient [[Egypt]].<ref>{{Cite web|title=The chemical composition of glass in Ancient Egypt by Mikey Brass (1999)|url=http://www.antiquityofman.com/AE_glass.html|access-date=2009-06-18}}</ref> 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. 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.
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