Until the early 1960s white lead ( lead carbonate / lead sulphate ) was added in substantial quantities as the main white pigment in some paint products intended for use as a primer or top coat over metal and wood, both internally and externally.
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White lead is a basic lead carbonate, ( PbCO 3 ) 2 �Pb ( OH ) 2, which has been used as a white pigment because of its opaque quality, though its use is now restricted because it can be a source for lead poisoning.
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So does carbon dioxide, due to the formation of insoluble lead carbonate; however an excess of the gas will result in the formation of soluble ( and potentially toxic if ingested over time ) lead bicarbonate, which can make the use of lead pipes dangerous.
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Paintings and the role of varnish, which might protect the white lead yet itself darken, aside according to Michelle Facini, a paper conservator at the National Gallery of Art, lead carbonate to lead sulfide is indeed what happens to some lead chalks / paints in drawings and watercolors and other works done on paper and unvarnished.
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Charles Goodyear invented a process for " vulcanizing " rubber by heating it to a high temperature in the presence of sulfur and lead carbonate or another chemical, so that it was converted from a soft, sticky, gummy product ( so-called India rubber ) to a hard, resilient, elastic, flexible product ( so-called vulcanized rubber ).
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