Preferably green food coloring. And details on how long to let it sit in and stuff like that would be appreciated.

Im going to be gunged for charity (Have a mixture of flour, water, and green food coloring poured over me) and ive heard conflicting reports over whether it will stain my hair. Im going to get gunged regardless because as someone told me, so many people dont have beautiful long hair or expensive clothes to worry about, they just worry about where they will sleep at night or what they will eat. But id like to save my hair if possible.

I want to dye my hair green for St Patrick’s Day tomorrow. All I have to dye it with is green food coloring. Will it work if I just mix a couple drops into my shampoo? Otherwise, how should I do it?
I’ve tried kool-aid and it just won’t stay in my hair! A friend in high school used to use food coloring to dye his hair and he’d do liberty spikes and such…I only need it for a day, and my hair is fairly light-colored.