COBALTIC a.
Pertaining to, derived from, or containing, cobalt; -- said especially of those compounds in which cobalt has higher valence; as, cobaltic oxide. Luteo-cobaltic compounds (Chem.), an extensive series of complex yellow compounds of ammonia and cobaltic salts. -- Roseo-cobaltic compounds (Chem.), an extensive series of…
COBALTOUS a.
Pertaining to, derived from, or containing, cobalt; -- said esp. of cobalt compounds in which the metal has its lower valence. 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 d…
COLOPHON n.
An inscription, monogram, or cipher, containing the place and date of publication, printer's name, etc., formerly placed on the last page of a book. The colophon, or final description, fell into disuse, and . . . the title page had become the principal direct means of identifying the book. De Morgan. The book was uninj…