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Pure Carbonate of Potassa

Put 12 troy ounces bicarbonate of potassa, in coarse powder, into a large iron crucible; heat gradually until the water of crystallization is driven off, then raise the heat to redness and maintain it at that heat for 30 minutes. When drain and dry. In this state it forms the cool, dissolve it in distilled water, filter, and commercial chromate of potash. By a second evaporate over a gentle fire until it thickens, then remove it from the fire and stir it constantly with an iron spatula until it granulates. (U. S. Ph.)