This is a series of methods for taking a spectator-shuffled deck and sorting it into piles of red and black - while blindfolded.

And one of the methods (as shown in the demo) gives you the ability to identify the suit and value of each card of a borrowed, shuffled deck, requiring no memorization.

There are six methods in total, three of which use "special" decks (can still be used for your other card magic), and the other two use borrowed decks. All of them can be done blindfolded.