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They're readily available in bark and some leaves, though you'd need to know how to extract it.

A simpler alternative is "brain tanning", there's an old saying that each animal has enough brain to tan its hide which is probably true enough for basic purposes. Brain tanning is still the way native americans do their tanning (colonists brought vegetable tanning to the americas, and modern mineral and chemical tannings arose during the 19th century)




Recent Kevin McCloud series showed brain tanning in case anyone is interested. http://en.wikipedia.org/wiki/Kevin_McClouds_Man_Made_Home




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