What is the main ingredient in glow paint?

The main ingredient in glow paint is usually a phosphorescent material, such as zinc sulfide or strontium aluminate, which absorbs and stores light energy and then re-emits it as a glow in the dark. These materials are often mixed with a binding agent and pigment to create a paint that can be applied to various surfaces. The glow effect can vary based on the specific formulation and the duration of the luminescence.