Ask the spectator to choose a card and sign the back and the face of the card.

You then write an "X" on the back of the card, the spectator can rub it to prove it is real.Miraculously the "X" can be removed and transferred to the hand of the spectator!Without switches and using permanent markers.
Fully examinable and can be a souvenir

EASY TO DO
EASY TO MAKE
NO MAGNET
NO ELASTIC
NO BLACK ART
NO DUPLICATED
NO CHEMICAL
NO CGI EFFECT

Welcome to the WITCH INK, the magic ink revolution of the future!
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