Vintage Crackle Effect - Crack By Hand. The MagnaPrint Crackle range is a fully aqueous ready to use printing paste. The range consists of a clear and a white designed to give a print effect with a "cracked, aged" appearance on knitted/stretchy fabrics. MagnaPrint Eco Pigments can be added in order to achieve a desired shade. The white may also be used pure to give a white effect.