The iridescent flash of a fish in the sunlight is familiar to all people who fish, and to all aquatic and marine predators. This effect is caused by the iridocyte crystal cells in the dermal layer of fish skin. These cells refract light from the sun, which is then transmitted through the translucent scales. This characteristic coloration is finally available to luremakers and epoxy fly tiers. The Iridescent Finish System suspends precision cut glitter crystals in a clear, high strength finish to produce a distinctive prismatic effect similar to the flash of a baitfish.