One of the biggest and most important producers of carnival glass was Fenton Glass. Founded in 1905, by the bothers Frank L. and John W. Fenton, in Williamstown, West Virginia, the company quickly grew to prominence by producing an type of inexpensive glass ware known as "iridescent ware" or "Iridill". Mass produced by pressing and coating the hot glass with an iridescent substance, a process known as "doping", the finished product was widely purchased in the inter-war years. Although by the late 1930s, the popularity of carnival glass had waned.
In the mid-1950s, there was a revival of interest in both the older pieces, and in newer reproductions, and carnival glass enjoyed a vogue among collectors who sought the best pieces. Now a days, exceptionally rare or fine pieces can fetch as much as $15,000 at auction.
