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The metal would slowly react with water vapour in the air and carbon dioxide from the manure, turning into a white material now known to be a mixture of lead carbonate and lead hydroxide.

At the time, Randa said the “risk contribution theory” used in the case violated the due process rights of the defendants, which made the lead carbonate pigment.

The minerals containing lead are principally galenite or lead sulphate, cerussite or lead carbonate; while the zinc is contained in the minerals, sphalerite or zinc sulphide, calamine or zinc silicate, smithsonite or zinc carbonate, etc.

A variety containing 7% of zinc carbonate, replacing lead carbonate, is known as iglesiasite, from Iglesias in Sardinia, where it is found.

In this case, shake up a considerable bulk of the liquor with a few grams of lead carbonate, allow to settle and make the assay on 10 c.c. of the clear liquor.