Many individuals are interested in knowing what is thc tincture? Tinctures promote many of a plant's positive traits and extend its shelf life by removing plant waste that might otherwise rot, mold, or disintegrate. Plant components and vitamins are extracted through tinctures. Food-grade alcohol is used in tinctures to extract plant materials. Plant components that are not water-soluble can be distilled by soaking them in ethanol or vinegar.