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Test for White Lead

Commer- thrown down in the fibre of the wool, which cial carbonate of lead is never quite pure, being has been saturated in the first bath with the commonly adulterated with sulphate of baryta, sulphuric acid, and it will gain about eighteen (heavy spar), and sometimes with chalk. The per cent. in weight. former may be detected by its insolubility in 2699. Cremnitz White, a beautiful dilute nitric acid, and the latter by the nitric white, with less body than ordinary white solution yielding a white precipitate with oxalic lead; it is, doubtless, made by precipitation; or sulphuric acid, or oxalate of ammonia, after it, like ordinary white lead, decomposes sulhaving been treated with sulphuretted hy- phides, and is decomposed by sulphuretted drogen, or a hydrosulphuret, to throw down hydrogen. the lead. (Cooley.)