Package includes:24 jars, 2 packs. Waterproof Powders : They can be used in water based mediums like acrylic paints without any issues. Multi-purpose: Add luminous pigment powder to nail art, epoxy resins, bath bombs, paintings, water based mediums like acrylic paints, and watch them with amazement to burst into a powerful glow in the dark. These glow powder are also perfect for theme party, color runs, black-light parties and other fun night activities. Lighting Principle:Put The Powders Or Final Product Under Direct Light Or Under A UV Or Black Light Then The Colors Will Get Charged. Re-Charge Once The Glow Fades. Safe & Non-toxic: luminous powder is non-radioactive, non-irritating, harmless and odorless, which can be used as a pigment powder for body or beauty art in various party activities, also can be used as an additive in following transparent or translucent media to create crafts: epoxy resin, acrylic paint, ink, nails oil, glue, etc.