"Chartreuse green" (the web color known as "chartreuse" since the X11 colors were created in 1987 and then renamed the X11 web colors in 1991) is a web color that was named because it looked like the green color of a French liqueur called "green chartreuse", made since 1764. Before 1987, this color was called "yellow-green", but that name is now used for the web color "yellow-green", a medium dark shade of chartreuse green shown in the color chart below. 