A very easy, commercial and entertaining color changing knife routine in several phases. With ideas by Ken Brooke, Ascanio and Juan Tamariz. For close-up and walk around. A white knife (or any color) changes to black. You simply say that you are using TWO knives so you produce a white one. The two knives change places a few times and at the end everything can be examined (obviously you have to bring your own knives)!