Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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A dilute solution of ACETIC ACID . It is used as an astringent to help close the pores of a porous leather before tooling. This operation is essential, as close tooling may ruin adjacent lines unless the surface of the leather is compact and solid. Vinegar also helps to raise the grain of leather and thus accentuate the pattern. (130 , 335 )

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