Introduced as Iridescent Ware in 1907, carnival glass acquired that name unofficially from collectors in the 1950s. This marvelous glassware acquired its nickname from the metallic layer on its outside, which constantly changed colors. Iridescent Ware was made in ornately patterned molds, and was sprayed with a mixture of metallic salts before it had started to cool, which allowed for the color-changing effects that gave the glass its fame.
Made as both functional and ornamental objects and found in a wide array of colors, carnival glass is an inexpensive pressed glass, often called dope glass by glass factory workers because of the process of applying the iridescent coloring, which is known as doping. Its production can be traced back to as early as 1907, with many, many different pieces in over 150 distinct patterns. It did not, however, command the expected prices, and was subsequently discounted heavily.
Translucent colors such as amethyst, marigold, cobalt, green, and red compose this glass, though it is also made in an opaque white referred to as milk glass. The glass was also made in semi-transparent or translucent pale green, and was called Vaseline or uranium glass; trace amounts of uranium salts were contained in the glass, which could produce a faint green glass glow in reaction to UV light. This was, of course, before the hazards of radiation were fully known and understood.
Among the greatest producers of this type of glass was Millersburg glass Company in Ohio. The first glass products by that company were crystal however the Millersburg plant decided to follow success for iridescent glassware. So in the beginning of 1910 the Millersburg Company started its line of Radium glasswares
Carnival glass is a collector’s item. Prices of these glasses vary wildly from a few dollars to thousands of dollars. Carnival glass has become antique glass collectible and there is a good active market for it.
It is very hard to identify carnival glass. Most of the time, the makers didn’t mark their work, others only marked them part of the time. To figure out who made the glass one has to match, patterns, colors, sheen, edges, thickness and some other factors from old trade catalogs, examples of prior work or a reference material. Many manufacturers made close copies of rivals popular works to. So even for an experienced expert this is a hard task.
At the time of introduction in late 1907 the carnival glass was called as Iridescent Ware. However, people started using the name carnival only after collectors in the 1950s began to refer to it as such. Among the greatest producers of this type of glass was Millersburg glass Company in Ohio. The first glass products by that company were crystal however the Millersburg plant decided to follow success for iridescent glassware. There is a very active market for this item since it has become an antique glass collectible. So even for an experienced expert this is a hard task.