The home of SwiftCraftyMonkey! Join Susan as she obsesses about cosmetic chemistry and other things (some possibly related to monkeys). Often strange, occasionally useful, and always worth a stop as a point of interest on your journey through the Intertron.
It is a type of hydrolyzable tannin – one that, when combined with a weak acid or base, will produce a carbohydrate and phenolic acid. (Wikipedia)
Ellagitannins and gallotannins are both hydrolyzable tannins.