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 - Dioxazine Purple - A vivid mid-shade purple which is highly transparent. It is made from a coal tar pigment and when undiluted, can be used as a deep black.