Last year at the MTV Skins party, we broke open a Glo Stick and shook its gooey phosphorescence all over our hair, our cheeks, and our hands. We glowed in the dark the rest of the night - though we'll admit the whole activity was messy, and definitely filled with chemicals we probably shouldn't have touched.
Make Up For Ever has taken that impulse and turned it into a new powder called Fluo Night, which looks invisible in the bottle and blends seamlessly into any other makeup you have. Wear it under a black light and whatever parts you've "colored" will immediately glow.
A little goes a long way with this product, so apply it with a brush or a sponge, or sprinkle a teeny bit into your hairspray - that's really all you need. And just because it's dark outside doesn't mean you'll light up like a signal flare. You need an ultraviolet light for everything on your face to become illuminated - but considering even dive bars often have at least one, you'll be able to get real mileage out of it on your party circuit.