Using green and/or neon green food coloring, add enough to achieve 3 different shades of green. Start with just one or two drops – you can always add more, but you can’t take away. Suggested mix: For light green, use 1-2 drops green + 1-2 drops neon green. For medium green, use 2-3 drops green + 2-3 drops neon green. For dark, green use 5-6 drops green + 5-6 drops neon green.