nitroprussic

Ni`tro*prus"sic ( or , a. Etym: [Nitro- + prussic.] (Chem.) Defn: Pertaining to, derived from, or designating, a complex acid called nitroprussic acid, obtained indirectly by the action of nitric acid on potassium ferrocyanide (yellow prussiate), as a red crystalline unstable substance. It forms salts called nitroprussides, which give a rich purple color with alkaline subphides.

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