Thanks Mike. I mostly just used a coarse stone to sort of scrape away the rust to bring it barely to an edge and left it alone. I suppose, if I tried, it is sharp enough to cut my finger but just barely. I assumed that you need at least some sharpness to get between the fibers to start a split. The top of the blade is over 1/2" thick, making a pretty heavy wedge and can take some significant whaling. Once the weather cools off some next month, I will try again to rive some of the short logs and turning blanks I have collected.
--Nathan, TX. Hire the lazy man. He may not do as much work but that's because he will find a better way.