LUKAS Illu-Color Inks are an adaptable artistic medium that can be used for a number of different applications. This line of 27 well-balanced colors feature a high lightfast rating, water-resistance when dried, and are all inter-mixable. Illu-Color Inks apply excellently to all solid, non-chalky, grease-free surfaces. Smooth surfaces should be primed with LUKAS Airbrush Primer prior to application. Depending on the thickness of the layer, Illu-Color Inks can range from transparent to opaque.