Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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alder (bark)

The bark of the common alder tree (Alnus glutinosa), used to some extent in small tanneries in southeastern Europe and Turkey for tanning leather. The bark contains 9 to 16% or more tannin, while the dried fruit yields about 16% tannin. The use of alder bark is not extensive—mainly because, when used alone, it imparts an objectionable reddish-brown color to the leather, and also tends to make the leather brittle. Other alder barks have also been used in tanning, including Alnus incana (in Europe and North America), A. nepalesis and A. nitida (in India), and A. cordata (in Italy). (175 )

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