Explanatory notes
… of tannin as well as other substances such as sugar, mineral salts, organic acids, etc. They are generally brown, … are those from oak, chestnut, quebracho, pines, wattle (mimosa), sumach, myrobalans, vallonia, gambier, mangrove or … tanning extracts ( heading 14.04 ). (b) Tanning extracts mixed with synthetic tanning substances ( heading 32.02 ). …