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Homberg's Pyrophorus

Stir equal parts of alum and brown sugar (or 3 parts alum and 1 part wheat flour) in an iron ladle over the fire until dry; then put it into an earthen or coated glass phial, and keep it at a red heat so long as flame is emitted; then commonly fall out, or may be casily ex- 4342. Hare's Pyrophorus. Lampblack, pelled by pressure with a piece of wire. Keep 3 parts; burnt alum, 4 parts; carbonate of it in places where neither light nor heat has access, in phials filled with cold water which has been boiled, to expel all air, and enclose the phials in opaque cases.