Explanatory notes
… are those from oak, chestnut, quebracho, pines, wattle (mimosa), sumach, myrobalans, vallonia, gambier, mangrove or … impurities from the extraction process. The most common variety is gall-nut tannin (gallotannic acid). … or needle-like crystals, etc. They are used principally as mordants in dyeing, in the manufacture of inks, for the …