Colour Premonition

A spectator shuffles the deck and then, taking two cards at a time, divides the cards into three piles: cards that are both red, cards that are both black, and cards that are a mixture of red and black.  The magician shows his written premonition that correctly predicted the number of red and black cards in their respective piles.

You can also view this trick on YouTube at https://youtu.be/WSoMXzfsROA

You can see all the previous magic lessons here.