Effect: You ask a spectator to think of a number from 10-20. They pick one. Such as 15. You say to the specator. that you will count of 15 cards from the deck. So you do so. Then you say I will add the two digits together. 1+5=6. Then you say. I will subtract that from original number. You subtract 6 cards frome the pile of 15. You end up at a card. You take the card and say this card neither you have seen nor I have seen. You place the card aside. The performer takes an egg and rolls over the card a couple of times. The egg says "shell me". The performer cracks open the egg and finds that the card is printed on the egg. the egg never lies.
The performer cooses a card before he/she starts the trick. Such as the Ace of Spades. You place the ACE as the 9th card from the top of the deck. Then ask the spectator to choose a number from 10-20. When he chooses a number , the performer adds the two digits then subtracts the it from the original number. The original being 15. 5+1=6. 15-6=9
The 9th card from the top of the pile. You deal off 6 cards from the 15 cards dealt. At the 9th card. The performer knows it but says niether I or you have seen the card.
The trick to getting the egg have the card appear is simple. You have to go to a pharmacy and buy ALUM. This is ammonia aluminum sulfate. You combine 1 once of ALUM with 1 pint of vinegar. This is your solution. This will make enough for 100 eggs sor so . You get a brush and write the card on the egg. PRINT THE LETTERS ON EGG SHELL. Do this and let egg dry until there is no more writing seen on the egg. Then after this, you shall boil the egg for about 10-16 minutes. Preferably 16, take out of boil and cool. You are done with the trick. Have fun.