Carnival glass is a type of decorative glassware that features a colorful, iridescent finish. This unique effect is achieved by adding metallic salts during the glass-making process, which creates a shimmering surface that changes color depending on the angle of light. Popular in the early 20th century, carnival glass was often used for bowls, vases, and other ornamental items. The production of carnival glass began in the United States around 1907, with companies like Fenton Art Glass and Northwood leading the way. Today, collectors seek out these vibrant pieces, which are often characterized by their intricate patterns and rich colors, making them a cherished part of glassware history.