Lead can also block Kryptonite rays. Enemies to Superman have attempted to use objects to hide things from Superman, mistakenly thinking that doing so somehow makes the object invisible to the superhero. In reality, the opposite is true: for instance, when the Joker attempted to elude Superman by claiming to have hostages in numerous lead-lined coffins hidden throughout the city. Thus, the Joker anticipated that Superman would be too busy searching for the coffins while he escaped in a disguised lead-lined truck with his hostages. However, all Superman had to do is make a wide-angle scan of the city from above with his x-ray vision, and the lead coffins were instantly visible as opaque objects. With them spotted, Superman was able to search them quickly and then was able to resume searching for the Joker. That was completed equally quickly considering the Joker's getaway vehicle is just as visible to his x-ray vision, and considering lead is not a common material used in vehicle body construction, and Superman was able to quickly capture the clown.