COLORIMETRIC SOLUTIONS (CS)
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
1 DEFINITION
Colorimetric solutions are used in the preparation of the colorimetric standards for certain drugs and for evaluating color in some monographs.
For the preparation of matching fluids, see Color and Achromicity 〈631〉.
2 STORAGE
Store colorimetric solutions in suitably resistant, tight containers.
Change to read:
3 COMPARISON OF COLORS
Comparison of colors as directed in the Pharmacopeial tests preferably is made in matched color-comparison tubes or in a suitable colorimeter under conditions that ensure that the colorimetric reference solution and that of the specimen under test are treated alike in all respects. The comparison of colors is best made in layers of equal depth, and viewed transversely against a white background (see also Visual Comparison〈630〉.
It is particularly important that the sample and standard be compared at the same temperature, preferably 25°.
