Camera-and-Photography Info - Edwal Hypo-Check, Chemical Test for Exhausted Film & Paper Fixers, 4 Oz.

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Editorial reviews:

Tests fixer for exhaustion due to silver saturation. One or two drops will test the fixer and, if the fixers' still OK, no harm has been done to the bath. If the addition of Hypo-Check produces a cloudy condition, the bath is exhausted and the fixer should be discarded. A 3/4 oz. bottle provides 800 tests.