Optilux™ 505 Ultra Reflective Ink System Optilux™ 505 Ultra Reflective Plastisol is an easy to print, two-part, retro-reflective ink that contains light-reflecting microspheres. When a garment printed with Optilux™ 505 ink is exposed to a focused beam of light, such as that from a flashlight or an automobile headlight, it reflects or returns light back to the light source. Optilux™ 505 Ultra Reflective Plastisol can be used as a unique decorative tool to increase nighttime visibility of a printed design.