Demonstration of this, hold real creme de menthe up to light, light viewed through it will look red, due to blue being absorbed by the chlorophyll and fluoresced off as red because the alcohol solution is "dead", no where for the captured blue light to go, in a living leaf, the energy would make sugar. Red light captured is given off as heat. Cheap Creme de Menthe will only look green when viewing a light through the liquid, which means it was dyed with a chemical dye. Better Creme de Menthe the green comes from chlorophyll, and when a light is viewed through the liquid, the light should show red fluorescence.