- Joined
- Jun 22, 2023
- Messages
- 115
Hi folks - sorry for the hiatus - have been diligently working away on the gold stuff and am back to working with platinum.
Material is 2 part platinum and silver - NOT alloyed, rather Platinum coated in silver sleeve for a medical application. (it's actually close to about 6:1 by weight Platinum to Silver Ratio) I've been boiling in nitric and then fire cleaning (there's also molybdenum present) but getting mixed results, so was thinking of trying to clean a batch with AR. (Getting between 80 and 85% platinum purity)
I know I can get the silver out with HCL or Copper, but I'm wondering, should I drop the Platinum 1st with Ammonium Chloride, or second?
Harold has a great post here - Platinum Thread - but I think that's a how to recover rather than a how to start - maybe I'm reading it wrong?
BTW - Molybdenum really wreaks havoc on glassware - you get a nasty yellow sludge at the surface level that needs to be scraped off with a razor blade
Material is 2 part platinum and silver - NOT alloyed, rather Platinum coated in silver sleeve for a medical application. (it's actually close to about 6:1 by weight Platinum to Silver Ratio) I've been boiling in nitric and then fire cleaning (there's also molybdenum present) but getting mixed results, so was thinking of trying to clean a batch with AR. (Getting between 80 and 85% platinum purity)
I know I can get the silver out with HCL or Copper, but I'm wondering, should I drop the Platinum 1st with Ammonium Chloride, or second?
Harold has a great post here - Platinum Thread - but I think that's a how to recover rather than a how to start - maybe I'm reading it wrong?
BTW - Molybdenum really wreaks havoc on glassware - you get a nasty yellow sludge at the surface level that needs to be scraped off with a razor blade