TWO packs are required, one blue-backed, the other red, together with a double-backed card one side of which is red and the other blue. From the red pack take any card and place it face upwards third from the bottom of the blue pack. Under this put the card you wish to force, face downwards, and under this card any indifferent card. You now have the force card second from the bottom with a reversed card above it. On the red pack put the double-backed card, red side upwards. To make the force, take the blue pack and riffle shuffle it, being careful not to disturb the three bottom cards. Turn the pack face up and riffle till a spectator calls 'Stop'. Take the double-backed card from the top of the red pack, being careful not to expose its face, and insert it at this point, square the pack and cut it several times. Fan the pack face downwards. The only red back to show will be the card you previously put in the pack reversed. Show all the other cards are blue-backed and allow the spectator to remove the card under the red-backed card. The force is made. Openly remove the red-backed card and return it to the red-backed pack, showing that it is an ordinary card. The double-backed card remains in the blue pack to be used in your next trick or secretly removed, as the case may be.