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  • Lis48

    Senior Member
    English - British
    Under EU laws, glass that contains more than 4% lead can be called crystal. If it contains more than 10% lead then it can be called lead crystal. Adding lead softens the glass and makes it easier to cut/engrave it and the lead also diffracts the light so that it sparkles more. The higher the lead content, the more brilliant the chandelier.
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