The system of offset printing entails moving an picture onto a chain of etched aluminum plates. The plates incorporate cyan, magenta, yellow, and black inks. Using 4 colorings isn't always constrained to the four basic colours; offset printing can also utilize spot Pantone shade for custom-matching colours. In addition to being versatile, offset printing permits for using multiple ink colorings and may be used on a variety of materials, including corrugated and inflexible packaging.