I picked up a roll of Esun bronze filament at a Makerfaire a couple months ago, I printed a small statue with it and tried to polish it; the results are meh...
It looks kind of metallic out of the printer, but after leaving the print in a tumbler filled with brass screws for about 16 hours (as seen on some videos for the Colorfab bronzefill) it just looks kind of metallic again, nowhere near the results I've seen with the ColorFabb filaments.

Maybe I'm doing something wrong but it just doesn't seem to take a polish.