Definitions for "Gum arabic"
Secretion from the acacia tree used in lithographic etches and to help the stone reject ink and accept water. Also included in some intaglio lift-ground formulas.
Binder used for watercolours.
This natural gum of the acacia tree is a main ingredient in lithographic etching materials. It was also used as a glaze on the surface of some hand-colored prints (e.g. Currier and Ives) to produce a darker tone in certain areas.
A chemical used to desensitize the non-printing areas of a printing plate.
In offset lithography, used in platemaking and on press to desensitize the non-printing areas of plates, and with bichromate to sensitize deep-etch and bimetal plates.