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Where
you are: What
Is Offset Lithography? Image areas are photographically transferred to thin metal plates which are treated chemically to accept oil-based ink but repel water on the image areas. Conversely, non-image areas accept water but repel the oil-based ink. A plate first contacts rollers of a clean solution or water and then is inked by other rollers. The oil-based ink "sticks" to the image area. The inked image is then transferred from the plate to a rubber blanket. The rubber blanket then transfers the image onto the paper's surface. Because of the resilience of the rubber blanket, it's
possible to use offset lithography printing on a wide variety of surfaces
and for large quantities. Both spot colors and
CMYK colors can be used with this process. Tip: Affordable Graphic Design classes are available near you? Sign up for FREE information from top design schools. Some Links You May Find Useful 
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n
offset lithography (also known as plantographic) printing, plates carry
both the image and non-image areas on the same level (unlike 
