CHITOSAN (Positive charge) As the name implies, Chitosan is composed of chitin which is the structural element of the exoskeletons of crustaceans, such as crabs, shrimp and other shell fish. Chitosan is especially popular in clearing white wines, since it does not require the aid of tannins to clear. Chitosan has a reputation for being fairly gentle on the character of finished wine. Chitosan has some interesting effects on the growth of bean sprouts in zero gravity and is being developed for use as a sealer that heals scratches when exposed to sunlight. Perhaps someday entire spacecraft will be be chitinous!