Mottled Soap

Mottled Soap -

Owes its appearance to the addition of a silicate of soda solution and coloring matter (ultramarine blue, copperas, etc.,) employed to imitate the mottled effect of many soaps of former days - due then to the impurities left in by poor manufacturing methods. When copperas, or sulphate of iron, is used, a bluish oxide of iron marks the soap, changing to red oxide on exposure to the air.

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