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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 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.

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.

Millersburg glass Company, Ohio was one of the largest producers of this kind of glass. Though the first glass product of the company were crystal, the Millersburg plant decided to produce iridescent glassware looking to the popularity of it. In this way the Millersburg Company brought out its line of Radium glassware.

The prices of Carnival glass vary widely depending on their quality and availability. This glass is a highly collectible item with some of the pieces worth very little, while other, rarer items command thousands of dollars. There is a very active market for this item since it has become an 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 or Iridescent Ware was introduced in 1907 and had a metallic sheen from a spray of salts when hot. This inexpensive pressed glass, also known as dope glass is made for functional/ornamental objects. Due to lack of demand price was discounted. Available colors are primarily amethyst/marigold/cobalt/green/red. Vaseline or uranium glass had uranium salts and hence was discontinued. Millersburg glass Company was the greatest producer of this type of glass. Initially this was made as crystal and later on as iridescent glassware. The prices vary depending on their quality/availability. This is antique glass collectible and has market. Identification of this glass is based on patterns/colors/sheen/edges/thickness etc.