GOLDEN Interference Acrylic Colors offer a unique "flip" when viewed from different angles. Colors flip between a bright opalescent color and its complement. Over white or lighter surfaces, the color is more subtle and the "flip" effect is more obvious. Over black or darker surfaces the color is more obvious and the "flip" effect is less dramatic. Adding a very small amount of black to Interference Colors produces deeper opalescent effects. Combine with GOLDEN Gels (Gloss) and Fluid Acrylic Colors to create an endless variety of colors and effects.