Answer
No — cresol red (o-cresolsulphonephthalein) changes at pH 7.2–8.8 and 0.2–1.8; the two are different dyes.
Detailed question
Is m-cresol purple the same as cresol red?
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RXSOL CHEMO PHARMA International Navi Mumbai, India
Try "boiler water treatment", "tank cleaner" or a chemical name such as "citric acid".
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