Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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permanganate bath

A solution of one of the permanganate salts, such as salts of permanganic acid, potassium permanganate sodium permanganate, etc., used to remove stains from paper. Thirty grams of the permanganate in one liter of slightly warm water is the usual concentration. The sheets, subsequent to treatment, are washed under running water until as much of the purple stain of the permanganate as possible is removed. Not all of the salt can be removed by washing; therefore, the sheets are generally placed in a bath of 1 ounce of sulfurous acid to 1/2 liter of water until the original color is restored. The sheets are then washed again in running water and resized. (198 , 364 )

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