One of the biggest troubles most jewelry repair shops face is making their rhodium plating solution last longer. In my experience many shops don't know the methods to use to clean their rhodium or keep it from being contaminated. This can lead to rings with dark spots in the finish. Most often the things that can contaminate rhodium are organic compounds, polishing compounds and dirt or occasionally cross contamination from buffing wheels.
One of the best methods to control this sort of contamination is use a process with your rhodium plating.
Another way to control contamination of your rhodium is to make sure you separate the buffing wheels that you use for different metals. A residue of another metal on your piece can make your rhodium come out dark or spotted. Labeling and keeping buffing wheels separated by metal can keep this from happening.
If you still have trouble with contamination after these prevention techniques or you want to clean up already contaminated rhodium, you can use the filtration kits. These kits have a coal dust that you mix with the rhodium that pulls out the contaminants and then it gets filtered through a special paper that removes the coal dust. In the long run this can save a ton of money and make your rhodium last much longer.
One last tip to save money on your rhodium is to ask your supplier if they have it available to ship in the concentrated version rather than the pre-mixed because the pre-mixed version you will have to pay extra for shipping in chemical fees and it will take longer to ship because it has to be shipped by ground post.
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