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My personal opinion is that you should not mix two etchants together .
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Yup, vinegar is sufficient for most kris. Fruit acids (undiluted natural juice) like lime or ananas also work but seem to result in warmer colored etching.
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I have a suspicion that the blade you're working on might be monosteel .
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Seems pattern welded to me (no contrasting pamor material, of course).
Regards,
Kai