I tried this method with one of the very first kerises of my collection, more or less 35 years ago. I started with a Bali Keris with an almost undiscernible pamor and an uniform light grey colour. After one week treatment and a terrible smell all around, I found that the iron was corroded, while the nickel of the pamor was left intact and in relief, in great contrast with the blackish iron.
The result was good and there was no need to make further treatments to the blade, except rinsing and oiling. I have somewhere the pics taken before and after, shall publish them soon.
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