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03-0150 Photographer's Formulary Residual Hypo Test,100ml

03-0150 Photographer's Formulary Residual Hypo Test,100ml [BDR]

Photographers' Formulary

Regular price $34.60 Sale

Aussie Stock

Photographer's Formulary Residual Hypo Test is a simple chemical test that can be used to determine if a print or filmstrip has been adequately washed.

The test is based upon the formation of a yellow stain of silver sulfide - silver thiosulfate on the white of a test print (or the clear area of a negative film strip) when the test solution is applied.