Chocolate glass, sometimes mistakenly called caramel slag, was made by the Indiana Tumbler and Goblet Company of Greentown, Indiana, from 1900 to 1903. It was also made at other National Glass Company factories. Chocolate glass is pressed glass and ranges in color from a lighter latte color to a darker, espresso. Fenton Art Glass Co. made chocolate glass from about 1907 to 1915. More recent pieces have been made by Imperial and others.