Glass is basic stuff - melted sand, pretty much. But your lovely crystal decanter or goblet gets its heft and clarity from a big dose of lead, up to one-fourth by weight.
That lead can leach out into liquids containing alcohol, such as wine or brandy - significant enough amounts to be a health risk if stored in crystal over a long period of time.
Martha Foley and Curt Stager clear up the differences between glass and crystal, and explain how lead can become transparent.
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