Orders placed after 4PM on weekdays will not ship until the next business day. Orders placed after 12pm Fridays will not ship until the following Monday.
Faster shipping methods may be available; just upgrade during checkout.
*Some exclusions apply.
Enter new zip code to refresh estimated delivery time.
Photographer's 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.