All the keris that I have used the sulphur & rice water method on were blades that had been previously stained. I do not know, but I feel that what this method does is to reactivate existing traces of arsenic left of the blade from previous applications.
The first keris I tried this method on had a polished surface, similar to a Balinese keris, but it was Malay, not Balinese, the method worked well.
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