Photographers' FormularyResidual Hypo Test - 100ml
B&H # PHRHT100ML
MFR # 03-0150
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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.