Purple GlassColor is one of the most interesting qualities of glass, and many people collect according to color. Purple Glass is a sample of various collectible glassware made in the United States and Europe. Included are examples of Depression Era glass from American companies such as Tiffin, Fostoria, and Morgantown, to mid century blown glass from Blenko; from Italian mid century cased items to Scandinavian designer glass from Kosta, Orrefors, and Flygsfors.