The unique marking system hidden in the back-design of The Butterfly Playing Cards contains two different marking systems that can be used separately, and they will make you a miracle worker if they are combined. An explanation of this written marking system explanation is included, as well as a link to online video instructions.
The cards were designed by Stefan Eriksson with two main goals in mind.
1. They have to be complex and irregular enough to disguise the markings.
2. They have to be pretty enough to justify their use over a more common deck of playing cards.
Cartamundi's card stock is soft, the finishing feels amazing, and it is very durable. And their quality control is so strict that any deck containing even a single card that is off-cut for more than 0.5mm gets discarded.