Cobaltous chloride
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| a crystalline compound, CoCl2, of a pale rose color when hydrous, blue when dehydrated. Its solution is used for a sympathetic ink, the writing being nearly colorless when dried in the air, owing to absorbed moisture, and becoming bright blue when warmed. |
See also: Cobaltous
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.