Disclaimer: I haven't done any of this to a
PV (yet) but I
do have a degree in metalsmithing so, for what it's worth, here's what I would try:
1) using masking tape, block off any areas that you want to keep the finish on.
2) starting with a med-fine grit wet-dry sandpaper (320, 400) carefully sand the gold finish down. This may not be gritty enough. You might have to start with 220 and move up to the 400. If you want a satin finish, you can stop at 400 or sand to 600 and then hit the metal with a Scotch-Brite pad (the green ones people use for scrubbing pans) to get your desired finish.
3) with a small paintbrush, paint thin layers of GunBlue (can be found at sporting goods stores) on the exposed metal, wiping the excess off with a cotton cloth after each swipe. Don't use too much GunBlue or your color will just flake off. Less is more!
4) if you want to try sealing the patina I'd recommend using a TINY amount of paste wax. Although, I'd probably just leave it and re-do the GunBlue when it wore down too much.
Hope that helps.
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