I stumbled on this effect out of one of Karl Fulves books and I think it is really brilliant. The spectators can cut the deck and shuffle the deck and
with half of the deck face up and the other face down, the spectator can separate the colors from the face up part of the deck and the performer separates his from the face down portion of the deck. So if the spectator puts down, lets say 3 red cards,the performer puts down 3 facedown cards same with the black cards. At the end of the effect the performer has seperated his cards cards,red and black. A set up is reguired but I think it is in the concept of
"Out of This World" plot. Really brilliant

Giving a citation will enable others to try it out:

MORE SELF-WORKING CARD TRICKS by Karl Fulves
Blind Choice, page 50

Thanks duanebarry, I thought about it later but hadn't time to come back to it. Thanks again.

Nice effect. Another application of Gilbreath's principle.

Thanks for posting this. Another hidden gem in a Fulves book.

Blind choice is a great trick, but it is not what is described above. Closer to the effect that you describe is the trick found on page 53 of the same book called Posi-Negative Cards.

Awesome hidden gem thanks

Thanks for calling it out mtstic44. It was a hidden gem from me too. Yes, very strong trick.

John

My mistake, it is Pos-Negative. Thanks Magicmike1949. Both effects are hidden gems.

You should really check out "Equalizer Revealment" (Columbini/Trost). It can be found on Aldo on Trost volume 4 or 5. Spread cards left to right and have spec pick a card from each end (they will have picked one red and one black). While they're showing everybody their selections spread cards from right to left and have them insert them back in to the each end they took them out of. Go through the cards really quick and take both halves (seperated colors due to setup) and place them in two halves on table. Take portion of one of the halves, flip faceup and riffle shuffle into other half. Do same with other half. Repeat this literally as many times as you like. The spectator can even do it. Now take one of the whole halves (not a portion), flip it over and riffle shuffle in to the other half. YOU'RE ALL SET! Spread the cards on table and reveal that one of the cards they picked is the only red one among all of the blacks. Turn cards over and spread and other side reveals that the other card you chose at the start is the only black card among all the reds.

I cant tell you how impossible this looks to the spectator. Same kind of setup as OOTW. Please fellow magicians. Try this out then thank me. It simply kills!

Thanks for sharing !