Zink Paper is a thermal printing paper prouced solely by Zink, the patent holder. Zink paper is made with composite materials composed of different layers. Cyan, yellow, and magenta dye crystals are embedded between the overcoat and the polymer base. The patented crystals embedded in the paper are called Amorphochromic dye crystals on the company's website. Initially the crystal dyes inside the Zink paper are colorless. The thermal printer takes the paper and uses a particular heating process to develop each color (cyan, magenta, yellow and black) and therefore print the image. Zink state that the advantages of the paper are its durability (to light, water, and handling), recyclability, low cost, high print quality and that sheets can be made of arbitrary dimensions.