Following the drawing of the image, an aqueous solution of gum arabic, weakly acidified with nitric acid HNO3 is applied to the stone.
See gum arabic, pva.
[2] The coating of glue or adhesive on the back of an unused stamp.
The common kinds of postage stamp adhesives are gum Arabic (glossy), polyvinyl alcohol gum (matte and colorless), and PVA dextrin gum (greenish color).
Parts of postage stamps related articles: ...
Gum - the mucilage applied to the back of adhesive stamps, and has its basis crystalline gum arabic. Sometimes, the colour of the gum can be a determining factor in a new printing or variety.
Polyvinyl alcohol: an adhesive product used instead of gum arabic and other adhesives for stamps.
 See also: Sheet, Gum, Printing, Applied, Used
  
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