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Sec. I, Ch. 7: The Burning and Colouring of Precious Stones

Sec. I, Ch. 7: The Burning and Colouring of Precious Stones Page of 366 Sec. II, Ch. 1: The Diamond Text size:minus plus Restore normal size   Mail page  Print this page
TheĀ· Burning and Colouring of Precious Stones. 51
A green colour, resembling that of Chrysoprase, may be obtained by impregnating the Agate with certain salts of nickel or of chromium ; while a yellow tint is obtained by digestion in warm muriatic acid, the iron in the stone being thus converted into a chloride. In fact, the chemical resources of the German Chemist now enable the worker to colour, porous stones to any desired tint.
Sec. I, Ch. 7: The Burning and Colouring of Precious Stones Page of 366 Sec. II, Ch. 1: The Diamond
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