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CRYSTAL GLASS

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Crystal is high-quality glass containing at least 10% lead oxide. Lead added to the melt produces very clear glass resembling rock crystal. The English glassmaker George Ravenscroft discovered the process of making lead crystal in 1676. Crystal is coloured by adding various metallic oxides. Glass containing at least 24% lead oxide is called lead crystal. Glass containing at least 30% lead oxide is called full lead crystal. Lead added to the melt produces very clear glass resembling rock crystal. When cut and polished, crystal becomes quite brilliant.