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Boettger's Artificial Emerald

This is made in the same manner as his rubies, by employing nitrate of nickel instead of the chromate of potassa. The same plan, substi- of yellow may be produced by tinging a weak tuting oxide of chromium for chromate of alcoholic solution of shellac or mastich, by potassa, will produce gems of considerable hardness and beauty, though slightly opaque; which may, however, be lessened by the addition of a very little silica. digesting turmeric, annotto, saffron, or socotrine aloes therein. The former is the brightest and most fit for topazes. Or: Digest hay saffron in 5 or 6 times its weight of boiling water, until the latter becomes sufficiently colored; filter, and add a little solution of gum or isinglass. When dry, a coating of spirit Foils. These are leaves of polished varnish should be applied metal, put under stones or pastes,