A solution is colorless if it has the appearance of water R or solvent or is not more intensely colored than the reference solution B9. The examination of the degree of coloration of liquids in the brown-yellow-red range is carried out by one of the following 2 methods, as indicated in the monograph.
01/2008:20202 Method 1
Using the same 12 mm outer diameter colorless, clear, neutral glass tubes, compare 2,0 mL of liquid to be examined with 2,0 mL of water R or solvent or the reference solution specified below (see reference solutions tables). monograph, the depth of the sheet is 40 mm. Compare colors in diffuse daylight, view horizontally against a white background.
01/2008:20202 Method 2
Using the same tubes of colorless, clear, neutral glass with a flat bottom and an inner diameter of 15 mm to 25 mm, compare the liquid to be examined with water R or solvent or the reference solution indicated below (see reference solutions tables) monograph, the depth of the layer is 40 mm. Compare colors in diffused sunlight by looking vertically against a white background.
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