Liquitex Professional Acrylic Ink made with finely ground artist quality pigments instead of colorants. They dry quickly, are permanent, water resistant and non-clogging, which makes them ideal for a variety of techniques from watercolour effects to stamping. Colour Name - Red Oxide - An opaque, soft rust red single pigment color. An earth pigment, it is an oxide of iron and one of the oldest colors used by mankind.