Create black light paint by adding a small amount of brightening agent to regular paint. Brightening agents are often sold as fabric brighteners or whiteners. Brightening detergents can also be used as a substitute for brightening agents.
- Create the brightener
Add water to powdered brightener until the brightener dissolves. Stir the water into the brightener using a wooden stir stick. Liquid brighteners are also available and do not require mixing before adding them to the paint.
- Add the brightener
Mix the liquefied brightener into the paint. Add one part brightener to every twenty parts paint and mix the two components with a wooden paint stick until there are no streaks showing in the paint.
- Test the paint
Turn off all of the lights, and close any doors or windows to create a dark space. Turn on a black light and expose the paint to it; the paint should emit a fluorescent glow. If the glow is insufficient for its needed use, turn the lights in the room back on, and create more of the brightener. Add the additional brightener a small amount at a time, mixing the paint thoroughly before testing it again, until the paint emits the level of glow desired.