Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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sodium hydrosulfite

A crystalline salt (Na 2 S 2 O 4 ), prepared by the reaction of sodium bisulfite with zinc, or by the action of sulfur dioxide on sodium amalgam. It is used in bleaching paper pulps, especially mechanical pulps, and in leather manufacture as a reducing agent in dyeing. (17 , 306 )

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