Answer
The mixed ferricyanide–acid reagent degrades within a day and the ferricyanide can release toxic fumes with strong acid or heat; mix only what is needed.
Detailed question
Why must the solution be fresh?
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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The mixed ferricyanide–acid reagent degrades within a day and the ferricyanide can release toxic fumes with strong acid or heat; mix only what is needed.
Why must the solution be fresh?