Platinic adj. (Chem.) Of, pertaining to, or containing, platinum; used specifically to designate those compounds in which the element has a higher valence, as contrasted with the platinous compounds; as, platinic chloride (PtCl4).
... by warm aqua regia, forming a solution of "platinic chloride," H{2}PtCl{6}. This substance on evaporation remains as a brownish red deliquescent mass; on drying at 300 C. it is converted into platinous chloride, PtCl{2}, and becomes insoluble, and at a higher temperature ... — A Textbook of Assaying: For the Use of Those Connected with Mines. • Cornelius Beringer and John Jacob Beringer
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