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Halloo sir, just good old white vinegar =)
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This contrast is more than unusual for etching by vinegar.
Soaking rusted blades in organic acids can activate earlier etchants, especially warangan.
Usage of warangan might not have been terribly common but the blade from the historic pic does look like it got a good dose of arsenic! (Or merely some kind of paint?
)
Regards,
Kai