I have sunglasses that darken in the sun. Theyre photochromic. So, like my sunglasses, this lotion has a photochromic dye mixed in. As you lie in the sun, whatever lotion that's directly in the sun gets dark, but the lotion that isn't, doesn't. See? So, it gives you a self-leveling tan. And some neat effects, too. Put your hand on your stomach for a minute, and get a cool afterimage. Lie in the shadow of a picket fence, and you'll get stripes. As with the sunglasses, the afterimages are good for about ten minutes of walking around before they fade. -- pluterday, Sep 12 2003 make it in camoflage colors too ...reactive to the amount of light hitting the surface of the surface applied to ... all reptile-like ... sounds like somehting DeathNinja might dig (?).-- Letsbuildafort, Sep 12 2003 Definitely Sun-Baked! I love the idea...-- tatju, Sep 12 2003 random, halfbakery