Laser lemon is a fluorescent color, shown here in its non-fluorescent form. The color laser lemon was named by Crayola in 1990.Before that, from its formulation in 1972 to 1990, it had been incorrectly been named chartreuse. In actuality, a chartreuse color is one in which the green hex code has a slightly higher value than the red hex code in the RGB values of the color.