are produced as excrescences on the leaves of the oak by punctures of gallwasps, in which they ay their eggs. The Aleppo galls are most valued, but although those from the Levant are the best, there are others of inferior quality which come from Dalmatia and other places. They contain tannic or gallotannic acid, which is also present in sumach and tea, and are used in tanning, in the manufacture of blueblack ink, also for the production of certain tints in Turkeyred dye ing and in calicoprinting.
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