 The actual chemical process occurs at 100 degrees F, the paper (glossy or matte) is taken though color developer, then brief wash then via roller system into bleach/fix and then, chemicals are washed out of the paper via water, and since the paper is Resin Coated, it dries flat and even.The prints can be processed in photolab, or rotary tubes or trays by the photo hobbyist in a darkroom setting.Current manufacturers of RA-4 Chemistry include Kodak, Freestyle, Rollei, Unicolor and Tetenal as of 2017.