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Double salts of cerous chloride with stannic chloride, mercuric chloride, and platinic chloride are also known.

They give a characteristic pale red precipitate with sodium pyrophosphate, soluble in an excess of the precipitant; they also form precipitates on the addition of platinic chloride and potassium ferrocyanide.

A fine black image is obtained by toning in a solution of platinic chloride at 1 per 100 of water.

The potassic platinic chloride is an article of commerce.

For lantern slides they may be toned black by platinic chloride.