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 for Cobaltous chloride
From The Collaborative International Dictionary of English v.0.48 :

  Cobaltous \Co*balt"ous\, a. (Chem.)
     Pertaining to, derived from, or containing, cobalt; -- said
     esp. of cobalt compounds in which the metal has its lower
     [1913 Webster]
     Cobaltous chloride, 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.
        [1913 Webster]

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