Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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alum water

ALUM dissolved in water and used to sponge paper and the edges of books before laying on the marbling colors. The alum acts as a binding medium, attracting and securing the ox-gall and colors to the paper. It also acts as a mordant and is also useful in counteracting excessive gall. (161 , 264 , 335 )

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