Talk:Bronze Dragon/@comment-5081849-20150827200654/@comment-5670466-20150829020533

I think they based it on metals that have had some value over the centuries. If they based it on the use in coins then copper and steel would have been treasure dragons as both were used in the minting of US pennies. Copper is still used in the minting of coins. Platinum, as far as I know, was never used in the minting of coins but is used in high quality jewelry. Palladium is in the same metallic family as platinum. Although, with the Iron Age, iron should have been a treasure dragon.