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 - Cerulean Blue Hue - This is a rich blue opaque color with green undertones. Its name derives from the Latin caeruleum meaning sky-blue pigment, and is a careful combination of pigments closely resembling genuine cerulean blue.