Cobalt Blue, 170 (Liquitex Heavy Body)Cobalt Blue, 170 (59ml Tube) A clean blue single pigment. It was discovered in 1802 by French chemist Louis Thnard as an alternative to the expensive lapis lazuli blue pigment. This is thick, high viscosity, pigment rich professional acrylic color, ideal for impasto and texture. With a high concentration of lightfast artist quality pigment and a satin finish, Heavy Body Acrylic gives you rich, permanent color, with crisp brush strokes and knife marks.