http://www.youtube.com/watch?feature=player_embedded&v=fwgx2AzDuoE
The Diagonal Slow Change by Andrew Csirmaz is a stunningly visual
colorchange. It lets the spectators see the process of the card changing
it’s identity in a slow and elegant manner.
This is a challenging technique, but so rewarding, it is worth putting
time and effort in it. Remember: you will be able to accomplish an
astonishing colorchange with intricate sleight of hand.