Vegetable tanning refers to the use of natural tannins to create usable leather from hides. Natural tannins are present in bark, wood, leaves and fruits of chestnut, oak and hemlock trees. This process is time intensive, as it can take up to three weeks for the tannins to fully penetrate a hide. From an ecological perspective, vegetable tanning is preferable, however the leather produced is not stable in water as it shrivels and becomes brittle.
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