Carnival galss is a pressed glass that has a glaze of metallic salts that give it an “oil slick” appearance. We just had to know more about these pieces we got in stock and frequently see in our travels.
According to the entry in Wikipedia: Carnival glass originated as a glass called ‘Iridill’, produced beginning in 1908 by the Fenton Art Glass Company. Iridill was inspired by the fine blown art glass of Tiffany, and Iridill became known as the “Poor Man’s Tiffany”. It is said to have been distributed at carnivals and fairs, hoping that housewives would complete the pattern by purchasing the matching items.Carnival Glass was produced almost continuously until 2007, with the majority being produced in the US before 1925.
The best resource I have found is David Doty’s Carnival Glass Website. This site contains so much history and information, if you have even the slightest interest, take a look!