Many old vintage watches—especially military watches—have gold or white-ish colored paint on their hands or the numbers on their dials. This paint could potentially be made of a phosphorescent compound mixed with radium. This compound would cause the hands/numbers to glow in the dark. This type of mixture was often chosen over others because of the superiority of its glow and longevity. Unlike any other glow-in-the-dark paints, the radium-mixed paint.. Read More