Start by putting one red Queen on top of a regular poker deck, and the other
red Queen at the bottom, both face down.

Next, give the two black Queens to a spectator. Start dealing cards off the
top of the deck, laying them in a face down pile on the table, until the
spectator tells you to stop.

Have the spectator put the first black Queen, face up, onto the pile
(opposite to all the cards you have been laying down.) Drop the remainder of the
deck in your hand face down onto the black Queen. (So the only card facing up is
the black Queen.)

Next, repeat the process above, having the spectator put in the other black
Queen, face up, and drop the remainder of the deck on top of the black Queen,
again face down. Have the spectator cut the deck, and complete the cut.

Now announce that without any help from you the spectator was able to find
the black Queens’ sisters. Simply go to the black Queens, take them out, and the
cards immediately above each will, of course, be the red Queens.