One disc about the size of a 45 rpm phonograph is shown to be blank on both sides. A red silk is threaded through the center hole and as the silk is revolved, the color of the disc changes from black to red. When the silk is removed, both sides are shown to be red. Next a yellow silk is passed through the center hole and both sides of the disc change to yellow. Now a green silk is passed through the center hole of the disc and the two sides of the disc change to green. For a colorful finale, the red, yellow and green silks are threaded together through the center hole and now both sides of the disc change to a rainbow of all three colors!

Condition the silks appear new although there is some light marking that may have occurred in the actual dyeing. A wonderful visual effect. Condition fine.