“Girl in Pool,” uranium glass pin tray by Heinrich Hoffman, Czechoslovakia, 1928. Uranium glass reached its peak popularity from the 1880s through the 1930s, particularly in Europe and America. This distinctive glass type, often referred to as Vaseline glass due to its similarity to petroleum jelly in appearance, contains uranium oxide which gives it its characteristic yellowish-green color. In the early 20th century, particularly during the Art Deco period, artists and glassmakers frequently employed uranium glass due to its luminous quality and striking visual effects under certain lighting conditions.