Can I stain my skin blue with food dye, or food colouring?
food dyes will streak and could stain for days its not meant for the skin, l doubt it would cause too much damage as its edible but remember that the skin is an organ like the heart and liver. The reason its covered with pores is so it can breath if you block too many of those pores then you die. Plus the skin on the face is much more sensitive an area be careful what you put on it or you could break out in spots or a rash, so if you want to turn blue use body paints try those sold in a theatre/film shop just remember to buy the stuff to take it off too and never cover every inch of your body with it always leave a large unpainted surface that can breath.