perchromic acid, an acid containing chromium in one of its higher oxidation states.
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1854 J. Scoffern in Orr's Circle Sci., Chem. 449 Solutions containing perchromic acid possess a beautiful blue tint.
1990 Analyt. Lett.23 703 The formation of blue perchromic acid represents one of the most sensitive and selective tests for the identification of chromium.