You can use either a torch cranked down real low or a coal from the fire held in a pair of tongs to burn rings in the handle like my top hawk. After you finish you will need to give it a good coat of boiled linseed oil, because it will be right brittle and will break easier than before if it is put to hard use or if you are throwing it.
The second one down is plain hickory like the burnt first one. Third is curly maple and is for Sunday-go-to-meetin`. Fourth is a pipe hawk with a hollow handle.