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- Aug 14, 2009
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Depends on what you're trying to do.Would all of the existing plating have to be removed first? Or could the replaying just go over it?
You don't need to remove existing rhodium to electroplate. The new rhodium plate layers won't "stick" to existing rhodium, but in general you don't really care - you're just trying to plate parts of the piece where the rhodium has worn away. The rhodium layers are microns thick so you won't see any delineation between where new and old rhodium meet or slightly overlap. The parts to be plated need to be pristine clean for the plating process to work, though.
When sizing or replating rings, jewellers will usually just polish the shank and then plate - they don't remove old rhodium from the head.
Getting rhodium *off* is another story. The only failsafe way to get it off is to grind it off. Really tough to do on pieces that have nooks and crannies. What some jewellers will do is plate a layer of nickel onto a piece first, and then apply rhodium - then they can chemically dissolve the nickel (with acid) to take the exterior rhodium layer off.
In this case IMO most likely either a bad batch of rhodium or it wasn't totally clean when the rhodium was applied. To "fix" just polish up the accessible surface where it's yellow and re-electroplate. Edit: To clarify - this is what any jeweller would do, not [just] Shay specifically.
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