Chartreuse is a color that was named because of its resemblance to the green color of one of the French liqueurs called green chartreuse.
The web color chartreuse is the color precisely halfway between green and yellow, so it is 50% green and 50% yellow.
A Crayola crayon named Chartreuse was created in 1972, but it was the incorrect color, a red-orange shade. It was renamed Atomic Tangerine in 1990.
The complementary (opposite) color of chartreuse is violet. Chartreuse is the most visible color to the human eye.