Mysteriously change the color of any coin into black

You borrow a coin and mysteriously change the color of a coin into black visually,

ROUTINE // You borrow a coin and ask them to sign it, you then put a drawing on the coin, (eg DOT, SKETCH, BORDER ON THE SIDE OF THE COIN, SMILEY) after that you ask them to light the lighter and you wave your hand over, visually the coin turn into black and with a rub it turn back into an ordinary coin, immediately hand the coin for examination and show your hand empty. Let's discover the secret of the CREEPYCOIN.

FULLY EXAMINABLE
END CLEAN