Thymol Blue
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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)
(Thymolsulfonphthalein), C27H30O5S - 466.59 - Dark-colored, crystalline powder. Slightly soluble in water; soluble in alcohol and in dilute alkali solutions. Acid -Transition interval: from pH 1.2 to 2.8. Color change: from red to yellow. Alkaline -Transition interval: from pH 8.0 to 9.2. Color change: from yellow to blue.
