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Jeweler's rhodium plating starts coming out black?

Can someone please, enlighten me.....I am using a 100 ml pyrex to rhodium plate about 12 pieces mens ring, which was finally polish with red jeweler's rouge ⇦ on eBay or Amazon [affil link] , heating the solution for about 3 mins in an electric stove and using a 3 volt DC rectifier with platinum plate connected to the positive terminal I started to plate the rings, I finish the 7th ring when I notice that the 8th ring and so on the 10th were black in color? can we recover back or clean dirty rhodium sulphate? please help...Ernny

Ernesto Belangoy
goldsmith - Cavite, Philippines
May 5, 2008

May 5, 2008

Hi, Erny. Do you have any way to check the rhodium concentration? I hate to state the obvious, but if you plated 7 rings from the solution and now you can plate no more, is it possible you used up the available rhodium?

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Ted Mooney, P.E.
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finishing.com - Pine Beach, New Jersey
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