Art Spectrum Liquid Spectrum Inks are more intense than Pigmented Ink. Suitable for airbrush, calligraphy, painting, drawing, illustration and multimedia applications. Suitable surfaces are: paper, primed canvas, artboards, metal, glass, some acetates and many other non-greasy, dust free surfaces. Water-resistant when dry. Dilute with Liquid Spectrum Medium or water. Available in 50ml and 250ml.