Photographers' Formulary Residual Hypo Test - 100mlPhotographers' Formulary 03 0150 Overview 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.
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Photographers' Formulary 03-0150 Overview
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.
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Photographers' Formulary Residual Hypo Test - 100ml