Answer
Methylene blue, potassium dichromate and sulphuric acid, matured (polychromed) in water; it is stored in a dark bottle and filtered before use.
Detailed question
What is in JSB solution 1?
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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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