> They are poisonous unless they are treated to remove the tannins. We
> just got an oak seedling which I planted. When I looked up information
> on it, it said this, but did not say how to go about removing the
> tannins so I did another web search and found that boiling the acorns
> with water changes until there is no brown color left when changing the
> water is one way. Another way is to soak them in water in which baking
> soda has been dissolved (1 TB / Liter water) for 12-15 hours. A third
> way is to put them in a bag and put them in a steam of flowing water for
> a few days, again until no brown is left when checking. This is from
> the wikiHow web site. https://www.wikihow.com/Use-Acorns-for-Food

In the UP of Michigan, some of the inland waterways have a red tint to them
which is caused by all of the tannins leached from the soil (which leaches
it from the roots of the trees in the area).  Taquamanon Falls, and one of
the lakes in Pictured Rocks, are two that I know of.  The falls, in
particular, has a very deep-red/deep-brown tint to it.  Also, if you are ever
out on Lake Superior viewing the cliffs at Pictured Rocks, tannins are one
of the things that color them (along with the copper and other minerals).

So, I am not surprised that removal involves waiting until their is no more
brown left.  :)

Mike

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 * SLMR 2.1a * EBCDIC: Erase Backup Chew Disk Ignite Cards