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Sulphuret of Potassium

Rub together 1 ounce sublimed sulphur, and 2 ounces dry carbonate of potassa; heat it gradually in a covered crucible until it ceases to swell and is completely melted. Pour the liquid on to a marble slab, and, when cold, break the mass into pieces, and keep in wellstopped bottle of green glass. (U. S. Ph.)