GOLDEN High Flow Iridescent and Interference Acrylic colors offer artists a unique view due to the colors seeming to "flip" or shimmer when seen at different angles. While Interference colors will change from an opalescent to its complement, the Iridescent colors will shimmer more rather than change tone. The lighter the surface these shades are applied to, the less dramatic of an effect will be observed. To create a deeper opalescent, GOLDEN recommends adding small amounts of black to any of the Interference acrylics. By combining GOLDEN Interface and Iridescent colors with their Fluid Acrylics and Gels, an endless amount of effects are possible! GOLDENs High Flow Acrylic Paint line is a high viscosity line allowing for both high levels of detail as well as covering large amounts of surface space. By formulating their High Flow acrylics with flow improvers, film levelers and retards, allows GOLDEN to develop such a thin, free-flowing product. Although GOLDENS High Flow line is thinner than most traditional formulas, they are still extremely versatile ranging from use in fine-line work, spraying and airbrush applications, as well as pen and ink techniques. This GOLDEN acrylic line is formulated with 100% polymer dispersion technology, giving artists a reliably durable layer, with significant resistance to water and other chemicals. Due to the thin nature of GOLDENs High Flow Acrylics some separation and settling will happen so be sure to shake thoroughly prior to use to ensure desired results are achieved.