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Printing processes Lithography This process uses a flat aluminium printing plate and works on the principle that oil and water do not mix. The image is transferred onto the plate photographically through ultra-violet light shining through a negative. The plate is then washed with a chemical that makes the image area attractive to the oily ink. The non-image area is later dampened with water to repel the ink. To lengthen the life of the printing plate and prevent the paper becoming damp through contact with the water, a rubber blanket transfers the ink from the plate to the paper. This is called offset lithography and is used for most commercial printing such as books, magazines, brochures etc. If rolls of paper are used rather than flat sheets the process can be speeded up and higher volumes printed. This is called web offset lithography. * 4 colours(process colours) - black, cyan, magenta and yellow...

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