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    Gum Tragacanth

    A gummy, water-soluble substance exuded by several species of Asian shrub of the genus Astragalus (in particular A. gummifer') used as a stiffening agent in pills, throat lozenges, and other such applications. It is also used as a binder in water-vehicle solutions, such as those used to make screen printing stencil emulsions.

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