Originally Posted by
epd
I had this problem before, I asked a couple of our resident experts and they mentioned decarburization(spelling?). On one occasion I completely re_cooked the blade, then reground and ended up with a little smaller blade, the other time I kept honing until I got to good steel, then reground to tighten up the bevel.
Good luck,
Eric
Edit: Im not to familiar with 10xx series steels, but I was under the impression that with 10xx you heat to critical and quench immeditely... 4 mins may have been too much.