Chartreuse refers only to the acidic green. There never has been a red chartreuse, but for whatever reason, hordes of people hold dear their memories of this alternate color. For some, it is nearer to magenta. For others, it's a brick red.
When did chartreuse become a color?
The color was named after a French liqueur called “chartreuse” which has a greenish-yellow hue. The liqueur was first produced in 1605 by the Carthusian monks of France, but likely not marketed to the public until the 1730s.
How does chartreuse get its color?
Green Chartreuse (110 proof or 55% ABV) is a naturally green liqueur made from 130 herbs and other plants macerated in alcohol and steeped for about eight hours. A last maceration of plants gives its color to the liqueur.