Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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A vegetable tanning material obtained from the roots and heartwood of a shrub or small tree, Rhus pentaphylla, occurring throughout the western part of North Africa. The heartwood may he expected to produce 20 to 23 o tannin, while the roots may have a tannin content as high as 28 to 29. Tizra, which is of the condensed class of tannins. closely resemblesQUEBRACHO both in chemical properties and tanning qualities. It has long been used in Morocco in the tanning of MOROCCO leathers. See also:VEGETABLE TANNINS .

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