High Quality Content by WIKIPEDIA articles! The now defunct Radium Dial Company, was one of a few United States companies along with the United States Radium Corporation, involved in the painting of clocks, watches and other instrument dials using radioluminescent paint containing radium. These dials are collectively known as radium dials. However unlike the US Radium Corporation, it was specifically set up to paint dials only, no other radium related processing took place.