This is a magic product called "Chameleon Champagne II." It allows you to change the color of water in a champagne glass to red wine, amber-colored whiskey, and a green cocktail each time a handkerchief is placed over it. In addition to the continuous color-changing effect of the liquid, this product also includes additional effects. It is sold at magic shops such as UGM Online Shop and Theo Magic. An instruction manual is included, but a handkerchief is not. Thank you.