lead bisilicate

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• lead processing — Introduction       preparation of the ore for use in various products.       Lead (Pb) is one of the oldest metals known, being one of seven metals used in the ancient world (the others are gold, silver, copper, iron, tin, and mercury). Its low… …   Universalium

• Frit — A frit (sometimes spelled fritt) is a ground glass or glaze used in pottery. Some materials have to be fritted before they can be used because they are soluble or toxic. For example, some lead compounds are toxic, and borax, used in glaze as a… …   Wikipedia

• Tin-glazing — is the process of giving ceramic items a tin based glaze which is white, shiny and opaque, normally applied to red or buff earthenware.The earliest tin glazed pottery appears to have been made in Iraq/Mesopotamia in the 9th century, the oldest… …   Wikipedia