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Carnival Glass, originally called Iridescent Ware, first came out in late 1907. It was not commonly referred to as Carnival Glass until the 1950s, though, when collectors started calling it that. These pieces were typically made from extremely ornate glass pieces, characterized by the myriad hues of their sheens. Their luster was achieved by applying metallic salt sprays to the glass before it had completely cooled down.

Carnival glass is an inexpensive pressed glass, made as both functional and ornamental objects, found in a wide spectrum of colors. This glass is sometimes referred to as dope glass by the glass workers because the process of applying the iridescent coloring to the surface is called doping. Its production started in 1907 in many different pieces in over 150 patterns. However, it did not command the prices expected, and was subsequently discounted.

This glass is made in many translucent colors like primarily amethyst, marigold, cobalt, green, and red. It is also made in opaque white, which is referred to as milk glass. Before the hazards of radiation were well known, the glass was also made in semi-transparent or translucent pale green and was named as Vaseline or uranium glass. Vaseline glass and uranium glass contain traces of uranium salts in the glass which can make a faint green glass glow in reaction to UV light.

Millersburg glass Company is one of the largest producers of this kind of glass. Crystals were the first glass products of the company. But they decided to go for iridescent glassware to ride the wave of enthusiasm. So, during the early 1910, the line of Radium Glassware was brought out by Millersburg glass Company.

Carnival glass is highly collectable item. Prices vary widely, with some of the pieces worth very little, while other, rarer items command thousands of dollars. It has become an antique glass collectible and there is a very active market for it.

Identification of carnival glass is very difficult task. Most of the manufacturers did not include a maker's mark in their product, while the others did so only for part of the time they produced the glass. To identify this glass, one has to match patterns, colors, sheen, edges, thickness, and other factors from old manufacturer's trade catalogs, other known examples, or other reference material. Since many manufacturers produced close copies of their rivals' popular patterns, identifying it is a challenge even for an expert.