Questions & Mysteries Is hardening visble?

#11
Based on one not being visible while the other is.
Lucci blocked zoro with no hardening and we know he uses haki
Never once was mentioned hardening is visible
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Zoro probably didn't think it could be residual haki or something. Anyway, Mihawk's words are a direct confirmation and they answer your question.
Mihawk talked about black blades not hardening tho
 
#13
Lucci blocked zoro with no hardening and we know he uses haki
Never once was mentioned hardening is visible
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Mihawk talked about black blades not hardening tho
He talked about CoA coating, he said Zoro couldn't drink alcohol until he'd make his blade black.
 
#14
Didn't Mihawk prohibit Zoro from drinking booze until he could "make his blade black"?

So yes, hardening is visible.
Makes no sense
He talked about CoA coating, he said Zoro couldn't drink alcohol until he'd make his blade black.
I think the haki and black blades are 2 different things mihawk said
First its about not damaging your swords dont drink until u use haki
And every blade can become black like mine
Dont think hardening is visible
 
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