Milk glass, also known as "opal glass," has been around since the 16th century, but the term "milk glass" was coined in the 20th century to describe the opaque plates, goblets, serving items, and decorative glassware objects that became popular in the late 1880s. Unlike typical glass, milk glass scatters light by the Tyndall effect, making some opal glass appear bluish from the side and reddish-orangeish in the pass-through light. To make...Continue Reading