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Cresol red

(Science: chemical) a reddish-brown powder which can be dissolved in water or alcohol that has the chemical formula of C21H18O5S. The dissolved compound has different colours depending on the ph, when the ph is 7.2 it is yellow, when the ph is 8.8 it is red, and when the ph is 2-3 it is orangish. As a result, it is used as an acid-base indicator. It is also used as a stain in the study of histology.