1. Prepare two playing cards with different colors on the back.

2. Choose any card of J, K and Q from a picture, and stick transparent double-sided tape in the middle of the card.

3. Put the card with double-sided tape on top of another pair of cards, and then spread out the cards for the audience to pick one at will and sign it.

4. Put away the cards, put the signature card on the first card and wash the cards once.

5. Draw the signed card, the back of the card is already another set.

It's simple, but there are a few points to note:

1, the seal card and the double-sided adhesive card must be placed correctly, otherwise there will be defects.

2. Be careful not to separate the two cards when shuffling.