Blue Radium Powder refers to a fine powdered form of the element radium. It is a silvery-white metal that emits a faint blue glow in the dark due to its radioactive properties. These were used to create glow-in-the-dark effects on watch dials, instrument panels, and other objects. The offered powder contained a mixture of radium and a phosphor material, which emitted light when excited by the radiation from radium. Moreover, the Blue Radium Powder is primarily used in specific scientific and medical applications, such as cancer treatments and radiographic imaging.