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try to boil the blade in salty water and then after 30 or so minutes, start using a brush with hard plastic bristles to remove the black paint.
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No, salt will be very tough to remove completely from keris blades which can be quite porous: Any chloride traces left will greatly foster rust development!
There is a reason why marine archeology of metals employs very specialized preservation methods that literally take years to complete!
Regards,
Kai