Neon colors which emit a glow (fluoresce). Fluorescent Colors work best over a white base such as Createx Opaque White or AutoBorne Sealer White. Fluorescent colors are NOT lightfast. The fluorescence is due to the pigment being in a rapid state of decay. Fluorescent colors are not intended for permanent finishes. For best results apply over a color-keyed base color to hide fade of fluorescent pigment. Fluorescent Colors are very transparent out of the bottle and may be reduced with 5601 Transparent Base or 4012 High Performance Reducer to increase transparency and assist flow & atomization with smaller airbrush tip-sizes.