Radioluminescent paints are special coatings that glow in the dark due to the presence of radioactive materials, typically radium or strontium aluminate. These paints absorb energy from radiation and re-emit it as visible light, creating a luminous effect. They are often used in applications like watch dials, instrument panels, and emergency signs to enhance visibility in low-light conditions. The glow from radioluminescent paints can last for several hours after exposure to light, making them useful for safety and navigation. However, due to health concerns associated with radioactive materials, their use has declined, and safer alternatives, such as photoluminescent paints, are now more common.