This is the vanishing ink replacement cartridge for Double Cross

I cannot write the method here

And it's only because the Egypt Playing Cards was designed can the same mystery see the light of day again

Explained within the book is not just the technique

Invisible Deck Kicker | David Penn Purcell This is the vanishing inkUse this custom printed deck as an INCREDIBLE follow up to 'Invisible Deck' or as a stand alone routine. The '52 on 1 Card' has always been a great gag, but David Penn has turned this gag into a fully routined miracle! A miracle that happens in your spectator's hands. Under test conditions, one card is placed on your spectator's hand. They are asked to name ANY card. You explain that if the named card is on the other side of the card in their hand,