In theory. The edge is likely to turn wavy, then regrind. You would loose height and geometry.I'm not even close to an expert, but couldn't it be re-heat treated? Ya might lose a couple mm in height, but the right person should be able to handle it, (pun not intended).
Yes, looks like the patina is permanently fused to the knife at the molecular levelI say, just clean it up and use it. I'd be interested to hear your observations on what affect the induction had on the knife—whether better or worse. Don't write it off yet.
Personally, looks pretty cool. #wabisabi
When I first got into J-knives about a decade ago, I watched with fascination a Mark Richmond video on doing a mustard patina. @JayGee would get many views, with an instructional video on DIY 'induction patina'!Yes, looks like the patina is permanently fused to the knife at the molecular level
On your pic it looks way past blue in the circle. So it's been in a bad place temp wise, like tempered above 350c. It will probably be very soft.First step clean and sharpen - then I'll report back. But the KU has definitely changed in some parts, while being completely removed in others. On the non-pictured side of the knife there is a circle of perfectly removed KU precisely where the knife sat over the induction coil.