For MORE unusual MERCURY videos, check out my Mercury Playlist: http://www.youtube.com/playlist?list=PL786EBDC8D2B4CD1D Many have asked what would happen when you try to use a sponge on mercury. I really didn't know for sure. Here ya go! The reason I used this type of foam sponge is because it had small cells and not a lot of voids like a typical sponge.