Testing Palladium from Platinum from white gold

Hello,
Thanks to Mark Mann at PAI, we now know how to test these metals for identification. Iodine will blacken palladium, slightly darken white gold and will not effect platinum at all. I am wondering if iodine will do for palladium what liver of sulphur does for silver.... seems an opportunity to play with metals again. Boss?.... I need some palladium again...