Phenolphthalein
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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)
[3,3-Bis(p-hydroxyphenyl)phthalide], C20H14O4 —318.32 [77-09-8]—White or faintly yellowish-white, crystalline powder. Insoluble in water; soluble in alcohol. Transition interval: from pH 8.0 to 10.0. Color change: from colorless to red.
