Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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wood ashes

The residue of burned wood, which contains potash-a very strong alkali. The alkali is recovered by leeching the ashes with water, and either it or the ashes themselves are used in some areas of the world, in a mixture with indigo, to render the hair of a hide brittle and easily removed by scraping. (130 )

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