Golden Interference Acrylic colors offer a unique interference flip. When viewed from difference perspectives, Interference colors flip between a bright opalescent color and its complement. When applied over white or lighter surfaces, the Interference color is less obvious and the flip effect is more obvious. When applied over black or darker surfaces, the Interference color is more obvious and the "flip" effect is less obvious. Most Golden Interference colors are available in two varieties: Coarse and Fine. They offer artists a range of reflective properties and interplay with light.