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Thymolphthalein acts as pH indicator, as reagent for blood after decolorizing the alkaline solution by boiling with zinc dust.
Roy AV. Rapid method for determining alkaline phosphatase activity in serum with thymolphthalein monophosphate.Clin. Chem.1970, 16,(5), 431-436.
Mohamed M. Ghoneim; Mohamed A. A. Ashy. Polarographic reduction of phenolphthalein, cresolphthalein, thymolphthalein, and α-naphtholphthalein in aqueous and nonaqueous ethanolic solutions. Canadian Journal of Chemistry. 1979, 57 (11), 1294-1298.
Acid-base indicator: pH 9.3 - 10.5.