Fluorescent Acrylic Colors are intense, brilliant colors, produced from dyes surrounded by a polymer coating. Because fluorescent colors are transparent, greater intensity is achieved by applying them over bright white surfaces. Fluorescent Colors are not lightfast. For permanency, a topcoat of GOLDEN MSA Varnish with UVLS (Ultra Violet Light Stabilizers) is recommended, although varnish and top coats will eliminate the fluorescent "glow" under black light.