As for the discolouration, this is most probably surface rust/oxodation. Of all the blades I cleaned this happened most rapidly to my bugis keris.
If you can't get it off by getting it under running water with detergent and a brush, put it back in vinegar for a short while and brush it off or use a pick. Bicarb slurry again, completely dry it, then wd40 immediately.
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