A. Dry-erase markers are made of resin or polymer, pigment, a co-solvent (such as alcohol) and ethanol or isopropyl. The ethanol or isopropyl acts as a carrier that helps the ink dry and not smear.

But a dry erase marker won’t turn any heads. And this one holds its own little secret. It acts as a master key for hotel room door locks. This is really more of a repackaging hack.