The Hends Krystal Flash Rainbow combines flash with an iridescent effect: the perceived color varies depending on the angle of the light. In a streamer’s wing, the fibers place these reflections in the center of the main material and contribute to the movement of the fly.
They can also be used to create tags, tips, or bands. The base color remains the primary choice, followed by the placement of the flash: a few fibers in a wing or a more distinctly shiny area on the body.