Thymolphthalein
Chemical compound
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Thymolphthalein is a phthalein dye used as an acid–base indicator. Its transition range is around pH 9.3–10.5. Below this pH, it is colorless; above, it is blue. The molar extinction coefficient for the blue thymolphthalein dianion is 38,000 M⁻¹... Wikipedia
Formula: C28H30O4
Molar mass: 430.53 g/mol
Melting point: 248 to 252 °C (478 to 486 °F; 521 to 525 K) (decomposes)
Ph range: around pH 9.3–10.5
NFPA 704 (fire diamond): 1 0 0