ROBERT FEAKON, of New Test for Cyanic Acid-W’IrmAb~ Trinity College, Dublin, Ireland (jour. Biol. Chem., 1926, 70, 785792), has devised the following test for
ROBERT FEAKON, of New Test for Cyanic Acid-W’IrmAb~ Trinity College, Dublin, Ireland (jour. Biol. Chem., 1926, 70, 785792), has devised the following test for cyanic acid and its salts. The reagent is prepared by addition of two to five drops of a 6 per cent. solution of benzidine in alcohol and several drops of a 6 per cent. solution of cupric acetate to 5 C.C. of water, and mixing. The cyanate solution, which must be either neutral or faintly acid, is added to the reagent. A purple color develops, and1 rapidly changes into a sepia precipitate, which soon deposits. This test will reveal the presence of 0.1 milligram, and even less, of potassium cyanate. Alkalies inhibit formation of the colored com