Encara no tenim significats per a "contain tannin".
1The root contains tannin and mucilage, it is therefore astringent and demulcent.
2Berry juice is quieting and soothing; it contains tannin.
3It contains tannin, and a particular bitter principle.
4Tea made experimentally, by pouring boiling water on the dry leaves placed on filter paper, contains tannin.
5The plant also contains tannin, resin, starch, succinic, malic, and acetic acids, with nitrate of potash, and other salts.
6The whole plant contains tannin, and a bitter principle, which is butyl-mustard oil, and on which the medicinal properties depend.
7Tannic acid inhibits gel formation (tannic acid is what causes overbrewed tea to taste bad; berries also contain tannins)