People used to make bread from acorns in hard times. Also if i remember well, you can use the water with the tanins to make black clothes...

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Interesting. Kinda like chicory coffee in a sense

Yes, exactly 👍

Yes, I read that too…so why waiting for hard times, if this is a healthy food?

The water turned kind of yellow-brownish…I think if you boil the acorns, the water might be darker and could surely be used for dyeing.

If i remember well, yes, you have to boil the clothes in that water to dye them black. Not 100% sure though but almost.

The tanins are not healthy and as you said, some may remain. It is more like an emergency food.