acid resist—Any substance that prevents the action of an acid or mordant on the surface of a plate.
actinic light—Light that possesses the radiant energy necessary to produce chemical changes in light-sensitive photographic emulsions. In orthochromatic film and dichromate emulsions, the UV and blue-green end of the spectrum has the greatest effect.
agitation—The regular or intermittent movement of a plate, film, or solution to allow fresh chemicals to periodically or constantly reach the material being processed.
à la poupée—(French, “with a doll”) The use of different daubers of different colors to ink small areas of a plate so as to distribute several colors over different areas of the plate.
alcohol—See ethyl and isopropyl alcohols. ...