This rainbow cane sphere is touched with brush of color using rods of glass. The marble is about 1.75 inches in size and captures the slight placement of tint. Bright colored glass cane is composed to create an optical of colored stripes. A graphite mold glides on the surface of the marble to create a perfect finish.
You can watch a video of a similar marble being made :
https://youtu.be/Bn6nYw4nYVQ?si=KM1w6089PFH6Ftxt