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Thymolphthalein - acid-base indicator. At pH 9,3-10,5 it is colorless, and above this value becomes blue.

Thymolphthalein is practically insoluble in water, soluble vetanole, acetone and chloroform.

In analytical chemistry used in the acid-base titration and determination of pH value during titration. Thymolphthalein may also be used as an invisible ink.

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