Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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water stain

A blemish on book papers, documents, etc., caused by the movement of materials within the paper, such as coloring matter, dust, acids, and the like, resulting from the paper being wetted with water, either accidently or during washing. The water itself does not stain the paper, unless it contains impurities which leave it and enter the paper fibers. Water stains can frequently be removed or reduced by hot water or a size bath.

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