FORMULARY RESIDUAL HYPO TEST is a simple chemical test that can be used to determine if a print or film strip 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.
Manufacturer: Photographers' Formulary
Catalog Number(s): 03-0150
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