On Jan 14, 2006, at 3:36 PM, Peter Todd wrote: > If you really want it to last forever, make it out of indium. > That stuff just doesn't oxidise, better than gold in that > regard. Also expensive, very, very expensive... I think you mean something else, perhaps iridium? Indium is neat stuff, but it's very soft, oxidize moderately easily (Indium Tin Oxide is the transparent conductive electrode on most LCDs), and only about as expensive as silver (call it $1/gram.) I've got a good quantity of indium from eBay that I've used to make room temperature liquid metals (with gallium.) BillW -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist