I've found alot of these WI handles that were lead coated. When you heat them in the oven, the lead melts, and drips in the oven. If I see the lead on them before that, I do what Jesse suggested. A wire wheel mounted to a bench grinder. It takes some work to get the lead of, but they will season quite well after that. If the lead is thick enough, and I want it off, which I always do considering the health risk, I heat them in the oven, and let the lead dripp on an old cookie sheet. Then let them cool, and clean the rest of with the wire wheel on the bench grinder.