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Chameleon Mineral

Mix equal weights of black oxide of manganese and pure potash, and heat them in a crucible.

Keep the compound in closely-stoppered bot- 2 or 3 times with a sponge dipped in alum tles. A solution of it in water passes through water (3 or 4 ounces to the pint), cr a soluvarious shades of color from green to red. tion of white size; observing to dry it care- 2638. Cadmium Yellow Color for fully after cach coat. This will tend to give Soap. The chemical works of Schering, in Berlin, have introduced two shades of sulphide of cadmium, a lemon and orange yellow, for lustre and beauty to the colors. The eclors themselves should also be thickened with gum. Before varnishing maps after coloring 1 LIQUID COLORS. them, 2 or 3 coats of clean size should be applied with a brush.