Offset lithography process
In the following system we are going to present how an offset lithography rotary works.
The iron is ready. It has parts that repel water and parts that adhere it. The places that avoid the ink will be the ones that take it.
The plate is placed on the cylinder technically known as the plate holder and in this way the paper is attached to the system.
When the system starts up, the fountain cylinders print the areas of the plate that must repel ink with a special solution. The areas to be printed are ready to repel water and remain unmoistened.
The plate rotates until it reaches the inking cylinders, which put a greasy ink on the plate. As the water does not allow it to adhere to the ink, the plate only picks up ink where it is going to be printed, that is, in the areas that are not wet.
The plate, already inked, rotates and comes into contact with the cylinder, whose rubber surface is the blanket. The image is printed upside down on the cylinder, which rotates contrary to the plate.
The paper passes between the rubber cylinder and the impression cylinder that serves to press the paper against the blanket.The paper receives the ink image of the blanket, which already passes through it in the correct way and that is to say no longer in an inverted way, leaving the art already printed as it should be.
Here is a video about the offset printing process of a newspaper.
Lithography Examples
Chromolithography example

Chromolithography is a unique and singular procedure for making impressions implementing different types of colors. This type of color lithographic printing came from the lithography process and bringing together all types of lithography using the color system.
Lithography example using limestone

For this type of printing, a limestone is handled on which the image to be printed is illustrated with a greasy material, either using a brush or a pencil. This method takes advantage of the incompatibility of grease or oily components and water, since wetting the stone will only retain the printing ink in the areas illustrated above.