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White crystalline powder. Soluble in ether, acetone, sulfuric acid and alkali solution, insoluble in water. It is often used as an indicator of acid and alkali, with a pH change range of 9.4-10.6 and a color change from colorless to blue. It is often used to prepare 0.1% 90% ethanol solution. It is also often combined with other indicators to form a gentle indicator, making its color change range narrower and observation clearer.
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