Effect: Performer shows a transparent glass full of liquid, such as milk, Coke, etc. He drinks from it until the glass is almost empty. The glass is placed behind his back, or under his coat for just a moment, and when brought forward is seen to be full of liquid once again! This can be repeated as often as desired.
You can use this very special glass in any liquid affect, to show a glass full of liquid or empty, as desired. A strong magical effect is of the glass filling itself visibly. For example, it can be used in conjunction with a prop like the “Wonder Glass”, where the liquid visibly diminishes from one glass and visibly appears in the other glass that is some distance away!