Marie - this is an ideal application for mass finishing - tumbling.
It would be better if you had a small vibratory tumbler, but you can
make it work with your rotary.
First - string your jump rings on plastic electrical ties so you can
find them maybe 10 or 20 per tie. The rings need to be able to move
so don’t crowd them on the ties. Then patinate your junp rings, get
’em really black. Then put them in your tumbler with a mild abrasive
and tumbling liquid and run for 4 to ? hours - you will have to check
to see if enough highlights are revealed. It takes about an hour in a
vibratory tumbler. When they look about right, rinse well and run in
your rotary with stainless steel for 30 minutes. You are Done!
Here are things that can go wrong. The rings have to be very clean
to take even patination. If they are spotty, clean them with
de-greaser, like simple green. If that isn’t good enough, run them
for an hour or two in the tumbler with abrasive, and a tiny bit of
de-greaser and water and then very carefully remove them using
implements - a tweezer or chop sticks - but not your fingers - so
they have no oil or grease on them. Rinse well in warm to hot water.
Then patinate. If you run them in steel prior to patination, you
won’t get particularly even patination - sometimes they just won’t
color. The abrasive media cleans the surface and makes for easy even
Dont even think of trying to do this by hand - you will go nuts.
Stringing the rings is optional but enormously time saving - no
treasure hunting in media for those pesky individual rings. If you
don’t have a pile of plastic electrical ties, you can use stainless
binding wire, do NOT use iron binding wire.