This is an ideal pocket trick. You start off by showing a silver glitter rod and cube. You now push the rod diagonally through the cube and it when it comes out the other side, it has now changed to red glitter. You take out the rod and show it all round.
Once again you push the rod back into the cube, now just place your hand in front of the cube and when you take it away the cube is now red. WOW! This is a great little effect and ideal for walk around.