Four Joker jumbo-sized cards(146x95mm) are shown and counted. They are, in fact, the Black Joker. One of the Black Joker is placed on the table, and once again, the remaining Black Joker are shown and counted. A second Black Joker is placed on top of that on the table. This leaves just two Black Joker cards, the faces being fully shown to your audience. These remaining two Black Joker cards are dropped onto the two on the table. The performer presents a magical chant, cards are picked up, counted face up [allowing your spectators to see the full face of each card] ... all the court cards have changed to the Colored Joker.
Only one technique, the "Elmsley Count," is required (detailed English instructions with illustrated included).
(In some sets, the Colored Jokers change into Black Jokers)