Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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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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