I am familiar with color mixing (Paints). When you mix red and green you get BROWN. Green jacket, red blood=brown spot. But to get brown, you would have to have approximately equal amount of each color.
What happens if you spill RED WINE on a GREEN JACKET?
What happens if you drool pizza sauce out of your mouth and onto a GREEN JACKET?
What happens if you drink a MIXED drink made with various LIQUORS and drool them out on a GREEN JACKET?