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Protochloride of Platinum

This is formed by exposing the dried and powdered bichloride (see No. 4084) for some time to a temperature of 450° Fahr. It is a greenish-grey, powder, insoluble in water, but sol- heat; cool, pulverize, add 25 parts fine copper uble in muriatic acid. 4086. Ammonio-Chloride of Plati- it over, and expose it for 20 minutes to a white num. A solution of sal-ammoniac is added heat. It consists of a superb red powder to a strong solution of bichloride of platinum with a metallic lustre. It is used as a pig- (see No 4084), avoiding excess; the precipitate ment and a bronze, and as a stain for glass is collected on a filter, washed with a little and enamel, to which it gives a rich red color. weak alcohol, and dried at a heat not exceed- Heat converts it into the black oxide. With ing 180° Fahr. It consists of minute, transparent, yellow crystals, very feebly soluble in water, less so in dilute alcohol, and insoluble in acids. By heating to redness, it is converted into spongy platinum. (See No. 3336.) ammonia it forms a colorless solution, which rapidly becomes blue from the action of the air. (Cooley.)