Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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brightening agents

Chemical agents at one time used extensively in leather dye batches to brighten the color of the finished leather. One such agent was sulfuric acid, which is not only destructive but virtually impossible to remove from leather effectively and completely. Another was formic acid, which, being weaker and more volatile, was less destructive. See also: P.I.R.A. TESTED . (298 )

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