Offset printing belongs to the category of indirect flat printing processes and is often used for print media like books and magazines, but also for advertising means and packaging. In this process, there is no direct contact between the printing plate and the paper. The colour is first applied to a blanket cylinder and then to the paper. This results in lasting effect for the printing plate, which can be used for several stocks and always results in the same quality. Prior to the print, four printing plates are created for the CMYK colours. Later, they are filled with paint or stay clear.