Gum bread crumb
The gum crumb of bread is a paste used like gum to erase the Fusain, the Sanguine or the pencils undermines. It absorbs much more effectively than traditional gums. It should be mixed, like a bread crumb pellet (from where its name), in order to clear up it Pigments fixed on its surface, and thus, to again be able to gum. Other favors: it does not leave a " copeaux" on the support.
See too
Gum to erase
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