If you are looking for an extreme visual color changing magic to show, that can change anything like a card, a paper or a dollar bill then this is your best choice.
Suppose, you have a card which back is blue, you show the card to the spectator and wave your pen over the card and the card will change its color slowly and visually by the time of waving. You can also do it with the card face, papers, and also with dollars. In every effect you are using your pen as your Magic Wand to change the color, and that’s how the name of this color change is Magic Wand.