One characteristic is common though: high tannin content in the bark of the tree concerned.

The pods without seeds have a tannin content of about 50%.

The grape is known for its low acidity and high tannin content.

It is also the most commonly used agent to reduce the tannin content.

The differential development is linked to the tannin content in the diet.

The tannin content of the bark is approximately 18%.

Parts of the tree have a tannin content of up to 18-20%.

The bark has a tannin content of about 20%.

The tannin content of the water is the source of the river's name.

Warm, acidic water is the best type used with a high tannin content that should be maintained all year round.