Attention all skeptics:
I was once skeptical about this effect, but recieved the full DVD, and this is actually a very creative and original effect.
The change isn't shown on camera because it is an optical illusion that happens with the design on the back of a red playing card. It only works with the human eye, so when it is shown on camera, it doesn't work.
No gaffed or gimmicked cards are used. You can borrow a red deck of cards and perform it with that deck. A routine is included where a card is signed, and changed from red to blue, and back and then is changed to complete blue, and given away as a souvineer.
This is a very interesting effect, and I think once it is released, some of the skeptics will realize that this will come in handy for some magicians, and I am interested in trying this out sometime. This is an easy, and incredibly original and smart effect.
If you don't know if you should buy it, you can visualize the effect in your mind. A red card slowly turns blue; blue streak spread across it, then they dissapear and the card turns back red. It is an optical illusion, but it works.