-- The Home Page of the Finishing Industry
23+ years of serious education, promoting Aloha,
& the most fun you can have in metal finishing smiley
    no popups, no spam
on this site
current topics
topic 5266

How to Bring Old Rhodium Back to New?


We have a jewelry polishing and plating business, and have a problem for the past few months with Rh plating. My Rh is getting very dark. I have done the charcoal filtering, added more distilled water, added more Rh when needed, keep it as clean as possible & yet I can't seem to get that "white, white" look I require. I have platinum anodes and I use the 1 gram bottles of concentrated Rh (dilute with distilled water). Last year I kept on replacing the Rh whenever this would happen with a new 1 gram bottle. I now have almost of gallon of the "used" Rh and would like to know how to replenish or refine that gallon so it can be used again?

Victor Points
- Boca Raton, Florida


You are getting a build up of metallic impurities in your rhodium bath which is unavoidable overtime. There is a method to precipitate most of these out with Potassium Ferrocyanide but it requires some analytical work and is not practical on a bath as small as yours. If you are using a quart of solution it likely contains 2 grams of rhodium when it is new so instead of adding concentrate your best bet is to just use up the rhodium before the metallic impurities have a chance to build up and then start with a fresh quart of solution.

Neil Bell
Red Sky Plating

supporting advertiser
Albuquerque, New Mexico
red sky banner ad

This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Comment to THIS thread START a NEW threadView CURRENT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2018, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.