The Duck Change is a hyper visual color change that occurs away from the deck.
In the motion of springing a card onto the top of the deck it visually transforms mid air into a different card.
This is an advanced technique and will require a great deal of practice, but those who pursue shall be rewarded with a wicked skill.
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Video - Part 1
Video - Part 2
A few variations on the Duck Change.
Video - Part 3
Gold Standard Card Trick Tutorial - visual packet trick where cards magically switch places with each other. It makes effective use of the Duck Change technique that was taught in the previous videos.