Red Mint Trick by Victor Sanz

A pack of gum visually changes color and flavor. 

First the box, then a single piece of gum and finally all of the pieces visible in the box. Each change is more impossible and visual than the previous. You'll be creating special effects live. Best of all, at the end, you can hand out the gum so the spectator can confirm that not only the color changed but the flavor changed too!! The pack includes a gimmick which will do all the work for you.