Can these mountain of local nuts do much in the dye pot?

TL;DR: For dyeing with acorns, pre-mordant with iron (6% WOF) gives a dark chocolate brown, iron dip after a dye with no mordant led to shades of grey.

I was curious to see if there was much dye potential in the piles of acorns I see in my neighbourhood every fall. I collected several pounds of these last September, dried them and had them ready to dye.