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?
Honor Marked Deck by JL Magic
Acro Index Dry Erase 3"X5" by Blake Vogt
Ultimate Forcing Deck (Red) by JT
Frame (RED) by Himitsu Magic
Highflyer (Blue Bicycle) by Peter Eggink
Monster Spellbound by Mott Sun
Insidious (DVD & Props) by Michael Scanzello
Ink by Bond, Pen & MS Magic