Thymol Blue 0.4%Thymol Blue 0. 4%, Buy now Ready to use Indicator solution for reliable and Reproducible results from Tristains indicators at Chemical World. Thymol Blue is an organic crystalline, pH indicator, which is a reddish brown or brownish green crystalline powder. It changes between red and yellow at pH 1. 2 2. 8, and it changes between yellow and blue at pH 8. 0 9. 6. It often becomes part of indicator systems. Thymol Blue has the chemical formula of

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