Regardless of the color, uranium glass emits neon green when exposed to ultraviolet (UV) light. The only reliable way to recognize genuine radioactive uranium glass is with ultraviolet light.  A glass that contains uranium oxide that glows under a black light is referred to as "uranium glass" in most situations. Vaseline and depression glass are two additional common names for glass. The uranium glass's eerie brightness and apparent danger have attracted many collectors, making it highly popular.