Persimmon tannin is a brown liquid made from astringent persimmons harvested when they are unripe and green; during this period the tannin content of the fruits is the highest. Unripe astringent persimmons are crushed, juiced and fermented to produce persimmon tannin. The tannin component has antiseptic, waterproofing, and insect deterrent effects, and has been used for many years as a dye for fishing nets, fabrics, and paper.