Sodium Bisulphite

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Sodium bisulphite

Acid rinse and stop baths
In combination with sodium acetate, used as a substitute for acetic acid
Can be used in conjunction with sodium chloride to make a substitute for hydrochloric acid

To  increase the life of the fixer solution sodium bisulfate can be used  in place of the acetic acid. This sets the pH between 4.6 and 5.0