What happened here?

Next question.....has that blade sustained damage to the point of being unusable?

Nope, I don't think that blade was hurt at all - just clean it up, should be pretty easy and not really removing any metal to speak of. With a tiny leak in foil, that same thing has happened to many of us.
 
I was heat treating these folder blades in the same packet and one is looking a lot different than the other. They were tip to tip in the packet, spine down. I held the foil up to the light and couldn't see any pin holes. If it was from air, maybe the fold on the foil? I double fold every seam.

WDixGt5h.jpg

This image/blade?
That looks to be steel burnt 1/2 way thru.
It may be my monitor but the steel looks like wool to me.
 
"experience can not be replaced with speculation" Something to keep in mind when discussing knife related things with established knife makers.
 
It's not your monitor, it's that you've never seen air hardened steel before it's been cleaned up. It has a matte, almost bead blasted look to it.

I opened the image in "MS Paint" I can now see the blade is marred on the surface only.
For this entire thread I was believing the blade had ignited, and burned thru.

That does indeed make my posts look foolish.
 
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