The word "tannic" refers to something that has an astringent or bitter taste, often found in certain kinds of beverages like red wine or tea. Full definition
The UAB researchers have previous experience making and testing biocompatible microcapsules with alternating layers of tannic acid and poly (N - vinylpyrrolidone), or TA / PVPON. (technologyalpha.net)
A process which includes months of soaking in electronically charged baths, and numerous coatings of tannic acid and microcrystalline wax. (cbhistory.org)
The finish is long with lingering tannic structure. (cellarangels.com)