How to make Acorn Flour

[Mark Ducati]

http://www.wikihow.com/Make-Acorn-Flour

Pretty useful info I never knew before :)

[AKTexas]

http://www.wikihow.com/Make-Acorn-Flour

Link fixed.

[ready]

Tannic Acid, that explains why my buddy spit out the acorn I made him eat.

[JTHunter]

Tannic acid is also the compound that gives tea and coffee their color.
You can also use a hollowed-out oak stump to tan leather.