Ann , thanks for your input .
Tom , I don't think the edge has been inserted , some of the homogenous areas are quite wide .
I was thinking more of the edge hardening process making the pattern disappear .
This is a pretty crazy pattern for a laminar welding process IMO .
Now this is a laminar forged Yat. blade and you can see the layering right up to the edge .
Then again I'm no genius about this stuff , all I do is push a broom around here and try to learn .