Golden - Fluid Acrylic - 4oz - Iridescent Copper (Fine) - GOLDEN Iridescent Acrylics are one of the most unique products available to artists today. They offer highly reflective metallic variations when mixed with GOLDEN colors. The GOLDEN Iridescent colors achieve their reflective properties by synthetically reproducing several natural phenomena - the nacreous, or pearlescent, qualities found in fish scales or the dust of a butterfly's wing, and the shiny and reflective qualities found in certain metals and minerals. GOLDEN "Coarse" Iridescent colors are simply larger particle size versions of our "Fine" Iridescent products. Coarse colors in the Iridescent line include Copper, Copper Light, Gold and Pearl. All GOLDEN Iridescent colors produce a luster quality by themselves, or when mixed with other colors and mediums. They GOLDEN line of Iridescents can be separated into 3 groups based on chemical composition.