Flap Card - How it Works
If you look closely at the back of the card you will see an elastic going across one of the ends:
(This is a Red to Blue flap card)
Using both hands, slowly separate the upper card from the lower card. (This will stretch the elastic)
Continue to pull...
Pull all the way down until the new color is showing:
Now you are ready to perform. As soon as you release, the card will snap shut again, creating the instant magic color change.
Thank you! Hope you enjoy your magic flap card!
The short clip below shows the flap card in slow-motion and at regular speed. (The video was made by taping the flap card down to the table and by using a small piece of double-sided tape as a "brake". The double-sided tape is visible on the blue side after the change)