We have the same problem sometimes. We will rhodium dozens of things
without a problem, them one just will not plate well, then another
dozen plate beautifully. I have always chalked that up to mysterious
alloys. We will polish and rerhodium the crappy looking ring, but it
will look spotty or dark and undeliverable. Our only recourse is to
replace the rhodium with fresh and try that. The new rhodium usually
works, but it bugs me to do that because I feel like I may be
contaminating perfectly good rhodium with something weird in the
ring that wouldn’t plate well.
I will state our rhodium plating procedures just in case it might
- Clean ring in ultrasonic (distilled water in ultrasonic)
- Steam clean (distilled water in steam cleaner)
- Electroclean (made with distilled water and Gesswein’s electro
cleaner powder, heated to whatever they say to heat it to, I’ve
- Dip to clean in distilled water.
- Electroplate with rhodium (3 volts, about 20 seconds, 3 gram
- Dip in distilled water
- Steam clean
It is weird that your ring would not plate. I don’t think the solder
had anything to do with it. And although it’s unnecessary to plate
platinum, it rhodium plates beautifully. I think it’s just one of
those mysteries that makes life interesting, and a pain in the ass,
usually in equal measures in my life. We would laser the area you
soldered, you should buy a laser Goo.