How To Turn Platinum Jewelry Into PURE PLATINUM Pt4

https://www.ebay.com/usr/sreetips

How To Turn Platinum Jewelry Into PURE PLATINUM Pt1
https://youtu.be/zwL7hfa1tuc

How To Turn Platinum Jewelry Into PURE PLATINUM Pt2
https://youtu.be/JhnjRlmiA6o

How To Turn Platinum Jewelry Into PURE PLATINUM Pt3
https://youtu.be/VXqjFKDcI0E

How To Turn Platinum Jewelry Into PURE PLATINUM Pt5
https://youtu.be/0Ilw33LeZjk

How To Turn Platinum Jewelry Into PURE PLATINUM Pt6
https://youtu.be/CYqr02lhEvs

How To Turn Platinum Jewelry Into PURE PLATINUM Pt7
https://youtu.be/ldcChDt8_7E

I treat the platinum solution with hot Aqua Regia to put any colloidal iridium back in solution. I evaporate to a syrup to rid the solution of excess nitric acid. Then I filter the platinum solution, and add a saturated solution of sodium bromate. The bromate will form complexes with the other platinum group metals, and the base metals, but will leave the platinum in solution for further refining.