How to Identify an Imperial Glass Pattern

Focus on the design. The Imperial Glass Company made a name for itself partly due to the geometric patterns it used on its pieces. Until the company came into being, Carnival glass designs usually incorporated patterns inspired by nature, such as leaves and vines. Imperial glass tends to reflect more triangular or diamond-like designs.

Look at the color. The Imperial Glass Company was renowned for developing unusual colors for its glassware; in particular, clambroth (a pale ginger color), smoke (a light blue-gray), and an unmatched deep purple, says World Collectors Net. During the years of the Great Depression, the company also became known for its pieces in characteristic pink and blue.

Assess the iridescence. Carnival glass is, by nature, iridescent or metallic-looking. But the Imperial Glass Company took iridescence to new heights. The look is created by adding metallic oxides to the hot glass, and Imperial was considered to obtain particularly brilliant results.