The link Wayne posted is spot on. You need the light to take away the shadows on the black object. Use your flash on the camera even on a sunny day. You may need to get closer depending on the intensity of your flash.
This technique works on people too like when they are wearing a cap and their face is shaded or the sun is one 1 side and the other side of their face is in a shadow.
If anyone tries this please post how your pics turned out or better yet post your pic.