This is a CGI effect that you can do in reality by only using ONE rubber band.The performer has a red rubber band in his hand. The color of the band will change slowly after the finger crosses the band.
What do you get?
CRAZY HOLE by Mickael Chatelain
Ultragaff Deck by Ellusionist
Magic by Misdirection by Dariel Fitzkee
Showmanship for Magicians by Dariel Fitzkee
The New Animated Card Box by Diamond Jim Tyler
Grandpa's Deck by Daytona Magic
Twitter by Pieras Fitikides
Ball and Tube Mystery by Magic Makers