Thymol blue photograph

Thymol Blue

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FormulaC27H30O5S
UV-vis (λmax)nm (1st
Melting point221–224 °C (430–435 °F; 494–497 K); decomposes
Molar mass466. 59 g·mol−1
Solubility in waterInsoluble
Main hazardsHarmful
Date of Reg.
Date of Upd.
ID1130277
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About Thymol Blue


Thymol blue is a brownish-green or reddish-brown crystalline powder that is used as a pH indicator. It is insoluble in water but soluble in alcohol and dilute alkali solutions. It transitions from red to yellow at pH 1. 2–2. 8 and from yellow to blue at pH 8. 0–9. 6. It is usually a component of Universal indicator.

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