This is an 1 ounce bottle of high grade ProFX Glow in the Dark Acrylic water based paint. Used by professional Cosmic Star Ceiling Artists. What is “Invisible Glow in the Dark Paint”? This is an illusion. The crystals in the paint are white and when placed on a white surface become virtually invisible. Hence the name. As such, it is not recommended for painting on to dark surfaces. PLEASE NOTE: Used externally, under moon light, street lamps, or car headlights, the paint will not show up: it must be DARK for the GLOW to be seen. In summer the paint supercharges because of the UV rays from sunlight, and this makes the paint REALLY POP. However, in the winter months when there is limited UV in the suns rays it is harder to charge the paint. We use UV black lights to help charge the paints in the winter months. These are specially designed black lights you can purchase from stores. ALL PHOTOS AND IMAGES PROPERTY OF GLOMANIA & PROGLOW USA