"First, Platinum and Palladium prints (as well as Pt and Pd toned silver prints) are actually not that stable."
According to Wikipedia:
Platinum prints are the most durable of all photographic processes. The platinum group metals are very stable against chemical reactions that might degrade the print—even more stable than gold. It is estimated that a platinum image, properly made, can last thousands of years.
According to the Collectors Guide:
Platinum prints are not only exceptionally beautiful, they are among the most permanent objects invented by human beings! The platinum metals (platinum and palladium) are more stable than gold. Incredibly, a platinum image, properly made, can last thousands of years. It is as enduring as steel or stone and will even outlive the fine paper it is printed upon.
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