DIY Card Marking Systems by AJ and Abhinav - ebookLearn six marking systems based on Bicycle Rider Back design. There are both reader back and coder back marking systems shared here. Each system is unique and is suited for various performing scenarios. This is a revised, refined and reformatted compilation of all the marking systems shared in the 3 volumes of Pigment and Pixel for the price of two individual ones. Reader Backs are marking systems where the value and suit are explicitly written on the