On David Blaine's Magic Man TV Special he makes initials mysteriously appear on his arm after rubbing ashes over his arm.

Idem
by Magix Effect


With this handy accessory, you can now perform the ashes on the arm effect not only very easily, but almost impromptu. It also opens up a wide range of effects not previously possible. This method is the most simple and practical available and will produce sharp and clear messages on your arm or hand.