cresolphthalein

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• cresolphthalein — cre·sol·phtha·lein (kre″sol thalґēn) an acid base indicator that is colorless at pH 7.2 and red at 8.8 …   Medical dictionary

• Colorimetric analysis — is a method of determining the concentration of a chemical element or chemical compound in a solution with the aid of a color reagent. It is applicable to both organic compounds and inorganic compounds and may be used with or without an enzymatic …   Wikipedia