Winsor & Newton Professional Acrylic (previously known as Artists' Acrylics) is our finest quality acrylic range and represents a breakthrough in acrylic colour technology. After extensive research and development, we are proud to present the brightest ever range of Professional Acrylic. By combining our colour making experience with the latest developments in resin technology we have taken 'brilliance' to a new level. And that's not all. Not only are our colours brilliant when wet but they remain as bright when dry - so what you see is what you get. Working with artists around the world confirmed that above all else, acrylic artists want the brightest, most vivid colours that do not change as they dry. Our range of Professional Acrylic represents a significant breakthrough in achieving this and much more. A heavy opaque pigment, Mars Black is a dense black colour with a brown undertone. It is made from mineral iron oxide and was therefore named after the alchemical name for iron: Mars.