Printing on clear material works best with black ink or very dark colours. Light colours are usually achieved by simply putting less ink onto white paper. But, as the material is clear, the lighter ink coverage just doesn't show up. Similarly, pictures or gradient effects don't have the same impact on clear as they do on opaque stocks and should be avoided. Therefore it is best to stick with solid vector shapes and thicker fonts in black or dark colours. The only way to use light colours on the clear stock would be to print the background of opaque white ink and then print on top of this solid area. This, and printing with only white ink, is only available through a custom quote request and has a minimum order of 1,000. The reason is that white ink requires a more labour intensive process than printing in black or dark colours, or printing on white material.