This method is NOT for use in processing emulsions. It is used in the making and coating of an emulsion.
Photo Flo dilution in water for processing is contained in the name. Photo Flo 200 is thus diluted 1:199 and Photo Flo 600 is diluted 1:599. For use with emulsion coating, the level must be determined by the coater. I use 1/2 ml for every 200 ml of 10% gelatin.