One of our customers had a need to color several hundred ft. of tubing for three pneumatic conveying lines. The lines are traveling at the factory ceiling an a labyrinth and the plant manager wanted a way to easily view each line from the floor. We offered two options. One is to extrude in transparent colors, and the other is to stripe our transparent stock tubing (a cost effective option that would still do the job).
Striping with a solvent is not painting, but embedding a colorant into the outer layer to the tube. It produces a smooth transparent color that is lasting and permanent. It works well on butyrate, acrylic, and polycarbonate tubing.