How can oak trees be used to tan leather?

If you intend to tan your own on a smaller scale I would recommend having a look at http://www.braintan.com/barktan/index. read more

It also refers to bark tanning where natural resins obtained from oak trees were used for tanning or manufacturing leather. Oak barks were stripped from the trees and dried for a long period of time before obtaining the tan out of it for applying in the animal skin hides. read more

Typical materials used for bark tanning include any of the oaks, fir, certain willows, chestnut, sumac leaves, oak galls, canaigre root, birch, alder, hemlock. Bearberry (leaves), heather, bloodroot, alfalfa, tea, sweet gale, pomegranate rinds, certain fern's rhizomes and wood-hops have also been used. read more