What does cold tone and warmtone mean in photographic papers?
Cold tone images often look bluish and cool. Warm toned papers look brownish or tanish and warm. The silver salts, or silver halides, that make up the active ingredient in paper emulsions is a combination of chloride and bromide salts, or “chlorobromide.” A bromide paper is cold tone and adjusting the mix of chloride and bromide makes a paper neutral to warmtone. Interestingly, a pure chloride paper is neutral tone paper, but the last of these, Kodak Azo, was discontinued a few years ago.
