tannin levels

Which Woods Are High In Tannins? Oak, walnut, cherry, and mahogany, have higher tannin levels, while maple, birch, and aspen rank low in tannin content and acidity. Unfortunately, both madrone and red alder fall into the high-tannin category. In fact, madrone bark has been used to tan leather. What is tannin rich wood? Tannin occurs