I found this colloidal Platinum: http://pubs.acs.org/doi/abs/10.1021/jp303363m
Can't find anything useful for Iridium.
Both Platinum and Iridium have isotopes which makes your search more difficult.
For more details, please check the link:
http://www.spooky2.com/forums/viewtopic.php?f=12&t=5265
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