gum tragacanth
A gum obtained as a dried exudate from various
Asiatic and Eastern European plants of the genus
Astragalus, especially A. gummifer. It consists of
bassorin and tragacanthin. and swells in water to
form a gel. Gum tragacanth has been used
extensively in the preparation of marbling size,
and is still used by some marblers. Also called
"gum dragon" and "gum elect." (235 , 236 , 335 )
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