The powders come in a variety of colors and particle sizes. Larger particles are brighter, but also make a rougher paint which can create a speckled look. Smaller particles create a smoother paint, but don’t glow as brightly.
Make sure that your paint medium works with your phosphorescent powder. For example, if you are planning to use a water-based medium, then you will need “coated glow powder” also known as “coated phosphorescent pigment”. For solvent or oil-based mediums, you can use standard or uncollated glow powder.
The powder will not dissolve in the paint, so just stir until the mixture is combined and no lumps remain.
If you do want to store your paint, pour it into a sealable container and be sure to stir it well before using it again.
Make sure that your highlighter glows under black lights. Test this by writing something on a piece of paper using your highlighter. Then, turn off the lights and hold the black light over it. You should see your test scribbles.
You may need to do this for several highlighters in order to create enough highlighter water.
This mixture will be pretty thin. The ratio should be equal parts cornstarch and highlighter water.
Consider pouring your paint into a few smaller containers. That way, you can create different colors using different food colors.
