photogelatin printing plate

photogelatin printing plate

[¦fōd·ō′jel·ət·ən ′print·iŋ ‚plāt]
(graphic arts)
An aluminum or heavy-glass base coated with a layer of light-sensitive gelatin, exposed to light through an unscreened photographic negative of the copy to be reproduced; after treatment, the printing image varies in thickness, moisture content, and ability to hold or repel printing ink. Also known as albertype; artotype; collotype; heliotype; phototype.