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Amethyst

Take 500 grains paste, 3 grains oxide of manganese, and 2 grains oxide of cobalt. Or: 4608 grains paste, 36 grains oxide of manganese, 24 grains oxide of cobalt, and 1 grain purple of cassuis. (Sec Nos. 2720 to 2723.) Or: 9216 grains paste, 15 to 24 grains oxide of manganese, and 1 grain oxide of cobalt.