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I made 240-320-400-600-800-1000 then white jewelers rouge on buffer. But you can start higher if scales do not have deep scratches. Black color will come back after a few minutes of sanding.

I have had the same scales a while ago. Someone told me it is Vulcanite scales and it is normal they turn brownish kaki color with age.

Just sand them down and they will go back to their original...