Oil reinforcement is a method of altering the tonal range of prints on matte or textured fiber papers. The dried print is rubbed with a medium consisting of two parts of turpentine to one of mastic varnish and one of linseed oil. Artists oil color is then applied locally to the print. One shot color camera is an obsolete plate camera making three color separation negatives from a single exposure. One shot developer is a developer that is used on a single occasion and then discarded.
Opacity is the light stopping power of a a material.
The greater the opacity of a substance, the more light its stops. In photography, opacity is expressed as a ration of the amount of light falling on the surface of the material to the amount of light transmitted by it. Opalescent is like opal, a material with a cloudy-white translucent appearance. Opal lamp is a filament lamp with an opal glass bulb for optimum diffusion. Opalotype is an obsolete printing process in which a carbon-process image is transferred on to translucent opal glass.