a.1.(Chem.) Pertaining to, or designating, a certain one of the highly oxidized compounds of chromium, which has a deep blue color, and is produced by the action of hydrogen peroxide.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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When potassium dichromate is added to this reaction mixture, activity of catalase is destroyed and any hydrogen peroxide that has not been split by the catalase reacts with dichromate to give a blue precipitate of perchromic acid.