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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