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luminous paint, paint that glows in the dark because it contains a phosphor, a substance that emits light for a certain length of time after exposure to an energy source, such as ultraviolet radiation. Zinc sulfide and calcium sulfide are such phosphors.

Some luminous paints contain a source of radiant energy, such as salts of radium. These paints glow indefinitely and are used for painting dials and signs to be read at night.