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1 The root contains tannin and mucilage, it is therefore astringent and demulcent.
2 Berry juice is quieting and soothing; it contains tannin .
3 It contains tannin , and a particular bitter principle.
4 Tea made experimentally, by pouring boiling water on the dry leaves placed on filter paper, contains tannin .
5 The plant also contains tannin , resin, starch, succinic, malic, and acetic acids, with nitrate of potash, and other salts.
6 The whole plant contains tannin , and a bitter principle, which is butyl-mustard oil, and on which the medicinal properties depend.
7 Tannic acid inhibits gel formation (tannic acid is what causes overbrewed tea to taste bad; berries also contain tannins )
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