This is UV Black Light Pigment and Paints, that are brightly during the day and will ONLY Fluoresce under UV Black Light. Classed as Daytime Visible Neon Black Light paints, these products POP in natural light but the become optically brighter when the particles are excited by UV rays. Sun light will make them noticeably visible during the day, but you will be able to experience the full fluorescence unless you are in a darkened environment. Used in the highlighting of Halloween Products, Club Venues even Table Tops and Bars as well as Nail Art, Body Painting, Jewelry, Resin Art ... Optimal Optical Brightness is around the 360nm field. TDS information is available from our store.