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A general term used for glass. In the 15th century the Venetians rediscovered a Roman method of making clear, colourless glass by adding manganese to the frit, which they called ‘vetro di cristallo’, because of its similarity to rock crystal. In England in the late 17th century George Ravenscroft produced a clear glass with the addition of lead oxide, often called lead crystal, which formed the basis for English glass that is still produced today.

Subjects: Art.

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