What is the timeline for discontinuation of production of slag glass?

Slag glass production was discontinued during the late 20th century. Though it is difficult to pinpoint an exact date for when they stopped making slag glass, it can be generally stated that its popularity declined after the 1920s and it became less commonly produced after the mid-20th century. Slag glass, also known as marble glass or malachite glass, was widely produced during the late 19th and early 20th centuries. Its distinctive appearance, created by adding slag or metal oxides to the molten glass, made it a popular material for decorative items such as lampshades, vases, and jewelry. However, by the 1930s, the demand for slag glass started diminishing due to changes in tastes and the emergence of newer glassmaking techniques. While some limited production may have continued after the 1930s, it is generally believed that the production of slag glass largely ceased by the late 20th century.