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Black Rhodium Plating

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Q. We are marketers of pgm and have had an enquiry about black Rhodium plating.

Can anyone advise how to Black Rhodium Plate jewellery? What products/processes are required?

Thanks

Neill Swan
- UK


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A. There are proprietary products for Black Rhodium. Turn to the big suppliers. I know you can find it in UK.

 
Sara Michaeli
    chemical process supplier
Israel



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A. We are building this kind of equipment for plating Jewellery, but are You sure about "Black" Rhodium? Or it is Ruthenium ?

Regards,

Lino Zorzi
- Romano d'Ezz. (VI) Italy

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A. There are a couple of informative patents on the subject:

US 441 6742
US 448 6513

These give reasonable details at the level of patent information.

Nahum Finkelstein
- Haifa Israel


November 5, 2008

Q. I just spoke to a plating shop that no longer offers black rhodium plating (even though it's still on their website) because it did not hold up to wear -- they too are looking for an answer. However everyone at the N.Y. JA show who showed it swore it would hold up very well. What gives?

Eve Alfille
- Evanston, Illinois


November 20, 2008

A. Hi, Eve. I am not a jeweler but I have fielded hundreds of complaints on this site about (white) rhodium plated rings turning yellow, and I suspect the issue is about the same: Rhodium plating is millionths of an inch thick. If it is plated onto a substrate that is the same color, and/or if the plating is on recessed low-wear areas, I suspect it's fine. If it's plated onto a high-wear area of a different color metal, it can't possibly look good for long.

Regards,

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey

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