Is the printing house 0 in front or behind?

Not heads or tails. According to the printing rules of the printing factory, 0/0 is bottom printing, that is, the front and back of the bottom need not be printed, and the 1/0 Pantone color card box is printed, that is, the front of the box is printed with monochrome (Pan Tong spot color) and 4/0 lithographic cover. Refers to four colors printed on the front of the cover, so 0 means neither the front nor the back. Printing is a technology to transfer ink to the surface of paper, fabric, leather and other materials through plate making, ink application and pressure.