lower grades can melt around 800 F and jet fuel is around 3100 F while blazing, still no where near low enough for cooking in the sunlight. Most ovens cook between 350 F and 500 F so the aluminum pans could be used inside, and eggs are cooked around 160 F or a little under that can be commonly cooked in the sun. so i seriously doubt the sun could melt bronze like that picture yet alone iron or steel.