Your post confuses me a little. You are not showing the keris blade here with the discolourization, just a pile of red dust. Where was this, inside the wrongko? I'm not sure what it is, but it doesn't quite look like rust accumulation.
Also confused by "He brought the keris to his Empu..." I did not realize that people can have a personal empu. Are you sure you don't mean pande/smith?
