And thats not all. Working with artists around the world confirmed that above all else, acrylic artists want the brightest, most vivid colors that do not change as they dry. Phthalo Blue (Green Shade) is a deep intense blue with a green undertone. It is made from the modern pigment Phthalocyanine which was introduced in the 1930s. 75oz/200ml tube of Winsor & Newton Professional Acrylic Color Conforms to ASTM D4236.