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Disappointing black rhodium results


#1

Hi All;

I recently tried applying black rhodium (pen plating) to a piece,
and although I didn’t expect it to be a really dark black, it was
pretty disappointing. The piece was done in Stuller’s bright white 14
karat alloy, had a high polish, was cleaned with electrocleaner,
rinsed in distilled water, dried with compressed air, and applied
with a new pen and tip reserved exclusively for this process. What I
got was a middling grey color, which seemed to actually lighten a bit
when put in the ultrasonic. Anybody have any tips for doing this to
get better results?

David L. Huffman


#2

David,

I’ve resisted trying black rhodium (too cheap) so can offer no real
help. Just a big thank you for saving me some $$. Rio does describe
it
as a grey-black, and the compressed air might be an additional
problem. One of my compressors blows oily air and the even with the
oil-less one that air is none too clean.

A really dark black is possible with Tellurium HCL based solutions
applied with a steel applicator (broken saw blade). Alas it is NOT
good in an ultrasonic. Usually I pickle copper plate and use LOS.

Jeff
Demand Designs
Analog/Digital Modelling & Goldsmithing
http://www.gmavt.net/~jdemand