At the time of introduction in late 1907 the carnival glass was called as Iridescent Ware. However, people started using the name carnival glass only after collectors in the 1950s began to refer to it as such. This innovative glassware made in highly patterned moulds had a vivid metallic sheen of changing hues on pressed glass articles. Iridescent Ware got the metallic sheen from a special spray of metallic salts on the glass while it was very hot.

Carnival glass is a colored, inexpensive pressed glass that was used to make both functional and ornamental objects. It can be found in a wide range of iridescent colors. Carnival glass is sometimes called dope glass by glass workers because doping is the process of applying the color to the glass surface. Carnival glass production started in 1907. It was used in production of many different pieces and in more than 150 patterns. However, since it did not command the prices expected, it was subsequently discounted.

The glass is produced in various translucent colors. Primarily amongst these are amethyst, marigold, cobalt, green, and red. Sometimes it is also made in opaque white which is called milk glass. A semi-transparent or translucent pale-green hue was also available before the widespread knowledge of radiation hazards. this glass was called Vaseline or uranium glass. Both of these contain traces of uranium salts which gives the glass a faint green glow when exposed to UV light.

One of the largest producers of this kind of glass was Millersburg glass Company, Ohio. The first glass products of the company were crystal, but the Millersburg plant decided to ride the wave of enthusiasm for iridescent glassware. Thus, in early 1910, the Millersburg Company brought out its line of Radium glassware

Carnival glass has become a popular item for collectors. Some pieces are worth pennies, but hard-to-find pieces can bring in hundreds or even thousands of dollars, making for a wide range in prices. The market is jumping for this antique glass collectible .

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 factures from old trade catalogs, examples of prior work or a reference material. Many manufacturers made dlose copies of rivals popular works to. So even for an experienced expert this is a hard task.

Carnival glass is made as both functional and ornamental objects. This innovative glassware made in highly patterned moulds has a vivid metallic sheen of changing hues on pressed glass articles. This glass is available in many translucent colors like primarily amethyst, marigold, cobalt, green and red. It is also made in opaque white, which is also referred to as milk glass. Prices vary widely depending on their quality and availability. It has become an antique glass collectible. To figure out who made the glass one has to match, patterns, colors, sheen, edges, thickness etc. One of the biggest producers is millersburg glass company in Ohio.