Product Description A rich mid-range green with a yellow undertone. Originally Sap Green was a lake pigment made from unripe buckthorn berries. This is 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.