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 - Cadmium Yellow Light Hue - A bright single pigment yellow hue color with high transparency. This hue is a recreation of the true inorganic cadmium pigment, which was discovered in 1817 as a by-product of the zinc industry.