Radium dial
= Radium dial
{wiki=Radium_dial}
A radium dial refers to a type of watch or clock dial that was painted with radium-based paint to create luminescence in low-light conditions. This technique became popular in the early 20th century, particularly during the 1920s to the 1960s. The primary advantage of using radium was its ability to glow in the dark, allowing users to read the time easily without needing an additional light source.