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Nitrate of Iron

The protonitrate of iron is obtained by dissolving protosulphuret of iron in dilute nitric acid in the cold, and evaporating the solution in a vacuum. It forms small green crystals, very soluble, and liable to oxidation. ashes, evaporating the solution to dryness, and fusing in iron pots for several hours.

This constitutes the potash of commerce.

Another method of preparation is to transfer the product of the first evaporation to an oven or furnace so constructed that the flame is made to play over the alkaline mass, kept constantly stirred with an iron rod. ignition is continued until the impurities are The