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.
Here is the best part: I wanted to charge 4.95$ for it, but I decided otherwise. You can choose how much you want to pay for it. If you don’t like it, you can walk away with it for free. If you like it, you can donate up to a zillion dollars.