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My Problems with rhodium are usually spotting,dark spots. This
problem occurs most often after i have used the same solution for a
period of time. I have had good fortune at time adding replenisher or
pen plating solution to the larger quantity usually 1/2 pint bottle.
which then began performing adequately during plating. other problems
included plating not adhering to platinum which may have been caused
by the acidity of the solution, the etching properties or whatever is
going on there chemically. My method of correcting plating solution
issues now are solved most easily by getting new solution, I find
that the time wasted not producing product is a much bigger loss than
a new bottle of rhodium. I rarely rhodium over silver so I cannot
comment about the silver contaminating the bath but i have had
wonderful results plating silver with palladium, leaving the item in
solution for longer periods with low voltage, if the item stays too
long sometimes it will mis-color but you then polish gently and
re-plate long enough to get good color
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