The primary characteristic that differentiates Glow In The Dark pigments from other colored pigments is that the pigment absorbs light energy (sunlight, interior light, etc.) and then slowly releases it as glow. <br> Glow In The Dark Pigments are the basic ingredient for most Glow In The Dark products. They are used by consumers and businesses to make craft projects, decorative cosmetics, make safer work and home environments, fishing widgets, and for hundreds of other extremely useful projects.