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My wife and I have both experienced skin burns from black walnut branches and leaves. We cut a split crotch off of the barn this weekend. I cut, she chipped. Where walnut sap contacted her skin, she now has stains and wet blisters.
I had a similar experience a few years ago chipping stump sprouts from the same tree. I developed extensive chemical burns on my forearms where the branches and leaves rubbed as I shoved them into the chipper!
This seems only to be a problem with wet walnut during the period where the sap is in the upper part of the tree. We've had no problems with walnut cut and chipped in the fall and winter.
I've also had skin reactions looking like chemical burns from fig and pistachio cut in the summer when the twigs and leaves are full of sap.
And no, the main trunk is only about 12" in diameter so I won't get any good walnut boards from it, just firewood. Maybe I'll cut a few bowl blanks.