"End of day" glass, also known as spatter glass, is a type of decorative glassware where leftover, colored glass shards are rolled onto a molten glass piece at the end of a shift, creating a unique, mottled pattern. This technique, which dates back to Roman times, was popular in the late 19th and early 20th centuries, particularly in Europe and America. The name "end of day" refers to the practice of using up leftover materials, with many of these unique "whimsies" made by glassblowers for personal use or to be sold.