The only chemical methods I know of are pretty noxious. Is it viable to immerse it in boiling water? Alternatively freeze it with freezer spray until it becomes brittle.
Yes. May need to be boiling water actually, over 90 degrees from memory. Used to shoot a longbow, and quickly learnt best way to remove brass points from broken arrows was to put them in a saucepan of boiling water. I used to make my own arrows and Araldite the points on.