The roots contain tannin and can be used to make a brown dye.

The plant also contains tannins that can act as an astringent.

This species contains tannin and is considered to be an astringent.

The bark contains tannins, which are used in tanning leather.

Like many species, it contains tannin in the bark and has been used to tan leather products.

I hoped this type of bark contained enough tannin, but apparently not.

There is concern that big doses of canaigre might contain enough tannins to cause cancer.

The flesh is then boiled in water that has been saturated with a number of herbs containing tannins.

Acorns also contain bitter tannins, the amount varying with the species.

Tea contains tannin - drink a 'stewed' cup to get the feel of it.