From now on the progression is Copper - Bronze - Silver - Gold - Platinum - Titanium
I don't mean to give you more work or anything, but shouldn't titanium come before platinum, platinum is way more elegant and more superior that Titanium
Perhaps you're right. I was sort of desperate to get rid of the default list when I wrote up this stuff. I ended up on Platinum and had some problems coming up with another element at the top. For a while I was tempted to use "carbon". In diamond form it would warrant its place at the top but as pencil lead it would look a bit out of place.
Maybe we should check out the prices and rank them according to cost. Or should we rank them according to rarity in the earth's crust instead?