This shader simulates ultraviolet fluorescence and blacklight reactions exclusively within Blender's EEVEE render engine. Rather than simply mixing diffuse and emission nodes, the setup utilizes EEVEE's Shader to RGB node to create a material that reacts to specific lighting conditions. It allows materials to exhibit different colors under normal light versus UV light.

Users can control fluorescence strength, glow amount, and target specific colors within a spectrum. By applying masks to these parameters, creators can design hidden elements or patterns that only become visible under simulated blacklight conditions.