Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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A blue vat dyestuff, with the formula (C 16 H 10 N 2 O 2 ), formerly derived by fermentation of the leaves of the herbaceous shrubs Isatis tinctoria, Polygonum tinctoria, etc., but now manufactured from anthranilic acid (C 16 H 10 N 2 O 2 ), and used, along with wood ashes, mainly in northern Nigeria, in the removal of hair from goatskin. In the 19th century the natural product was used, in conjunction with sulfuric acid, to make a blue coloring matter for use in the production of leather cover marbles. (130 )

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