A light sensitive coal tar product used as a coating on presensitized plates, as well as overlay proofs.
Sensitizer used in some emulsion systems to cure (fuse) a stencil.
A non-silver coating for photographic contact printing. In offset platemaking: a coating used on wipe-on and pre-sensitized plates.
A light sensitive coating used on printing plates.
A process normally used for reproduction in contact printing techniques or to provide a light sensitive coating for proofs and plates.
Light-sensitive coating on paper or film for making contact prints of technical drawings.
A non-silver coating for contact printing in photography. Also, a light-sensitive coating used on presensitized plates in offset platemaking.
abbreviation of diazonium compounds, which decompose under the action of intense blue or ultraviolet radiation, forming an image in an azo dye.
A photosensitive chemical added to emulsion used in making screens (stencil).
Photocopying method, which uses a coating of a diazo compound on the paper that makes it sensitive to ultraviolet light, so that when exposed to light, it decomposes.
Diazo refers to a type of organic compound that has the general forumula R2C=N2. The simplest example of a diazo compound is diazomethane. The electronic structure of diazo compounds involves a positive charge on the central nitrogen and negative charge distributed between the terminal nitrogen and the carbon.