Explanatory notes
… mangrove or divi-divi. The heading does not include : (a) Raw vegetable materials, whether dried, … gall-nut tannin (gallotannic acid). Other tannins include oak bark tannin (quercitannic acid), chestnut wood … The tannates classified in this heading include those of aluminium, bismuth, calcium, iron, manganese, zinc, …