ANTIMONY TRICHLORIDE TS, (U.S.P. TEST SOLUTION), also known as Butter of antimony or Antimonous chloride, is used as a reagent for detecting vitamin A and other carotenoids in the Carr-Price test. This product is a Spectrum solution concentrate that allows the preparation of fresh, reliable standard volumetric solutions quickly and accurately. Simply dilute the desired USP test solution concentrate to the specified volume (carefully following instructions provided with the package) and the resulting solution will have an exact Normality within 0.1%. Spectrum USP test solution concentrates are relied upon for fast, accurate results in life sciences and pharmaceutical quality control applications.