Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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A dye obtained from certain lichens of the genera Roccella and Lecanora by means of fermentation. Its hue varies from moderate red to dark purplish-red, depending on whether the dye bath is acid or alkaline. It was used in the past in the manufacture of purple marbling color. It has only moderate COLOR FASTNESS . (97 , 152 )

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