Hello Flavio,
Quote:
Anyway I haven't taken pictures because it wasn't worth. I have polished and etched twice one side of the blade, one time with cloruric ferric and than with lemon, but nothing. Anyway I will try again on the whole blade with vinegar....
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Hmm, weird - don't give up unless you get clear evidence for some other pattern!
Please do take close-ups of the blade at each step! Even it may not look pretty there may be more hints on this blade. If these suggest twist core and the blade is just difficult to stain, this may be worth handing over to Philip Tom.
Regards,
Kai