"Leon" wrote in message
. ..

"JohnB" wrote in message
oups.com...
On Jun 8, 1:05 pm, "Leon" wrote:
"

Yes it is a carbide blade. The discoloration, bluish in color, is
visible on three teeth out of thirty and is not on the brazing but on
the side of these carbide teeth and across the face of one.


New to me, usually a discoloration in the metal color like that means the
hardness has been compromised. I would be leery, I have never seen
carbide
to that.



I have. Over the years, I have ground a great deal of carbide, by hand and
by machine. It will discolor if you get it hot. Once cooled, it has no
effect on it. The discoloration is cosmetic only.