Tanbark is the bark of certain species of trees, traditionally used for tanning hides into leather.[1]
The words "tannin", "tanning", "tan," and "tawny" are derived from the Medieval Latin tannare, "to convert into leather."
Bark mills are horse- or oxen-driven or water-powered edge mills[2] and were used in earlier times to shred the tanbark to derive tannins for the leather industry. A "barker" was a person who stripped bark from trees to supply bark mills.