Here is another site...
http://www.lenntech.com/periodic/elements/pt.htm
"platinum will not oxidize in air no matter how strongly it is heated."
"It has a coefficient of expansion almost equal to that of soda-lime-silica glass, and is therefore used to make sealed electrodes in glass systems. Hydrogen and oxygen gas mixtures explode in the presence of platinum wire."
As Kalera said I would be more worried about the "unknown metals" It sounds as if it may be interesting to try in beads?