Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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The process of reducing the shade (whiteness) of a document or leaf as nearly as possible to its original color following washing and/or deacidification. The "toner" may he the gelatin size itself, which will reduce whiteness to a slight extent, or, if a greater toning effect is required, a surface active (cationic) vegetable dye in very dilute solution may be used. (154 , 235 )

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