Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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shrink temperature

The water temperature at which a specimen of leather begins to shrink. Shrink temperature will differ for each kind and degree of tannage, although, in general, tannage usually increases the resistance of a leather to heat in the wet condition. Most chrome-tanned leathers are resistant to the action of boiling water, while vegetable-tanned leathers are not. If leather that cannot withstand the boiling test is placed in cold water and the temperature of the water is gradually increased one degree at a time. a point will be reached where the leather suddenly begins to shrink, which is the "shrink temperature." Shrink temperature is generally taken as a measure of the degree of tannage of a leather. (291 , 363 )

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