The Photographer's Formulary Reducer II for Negatives is a persulfate reducer. Reducer II is a super proportional reducer and removes silver from the dense areas of the negative faster than it does from the faint areas. The net result is a decrease in negative contrast.
The chemicals in the kit are used to make 1 liter of working solution and 1 liter of an after-bath solution containing sodium sulfite.
UPC: 675152500205