Response to Stopbath - further to below

I don't see any objection to Citric Acid. In fact almost any mild acid could be used as long as it doesn't have a hardening or solvent effect on the emulsion or throw a sediment. Citric, Boric, Tartaric, even very dilute Hydrochloric should all be suitable. I bet even wine maker's anti-oxidant tablets would work.

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