Lithography is a form of Planographic printing which is used mainly for commercial printing due to the high speed and low cost

does not mix. The actual image attracts the grease (the ink) while the areas left blank attract water and therefore reject the ink. Only four colours are used; yellow, cyan, magenta and black, filters separate the colours into tiny dots which make up the picture. The best machines print in colour on both sides of the paper at once. They can print off either sheets or reels of paper. The process has a printing plate which is free to rotate. The printing plate is dampened so when ink is put on the plate the ink is repelled off any non-image areas. The printing plate then transfers an inked image onto the rubber blanket cylinder which presses the image onto the card or paper as it is fed through.     Die Cutting Die cutting makes nets or shapes using different kinds of steel dies to score/cut/crease the surface. There are three different kinds of die cutting; hollow die cutting which is done with a hollow die which looks like a cookie cutter. This is used for only letters and envelopes. Steel rule die cutting is used when a close register is needed. Steel rules are made into the required shape and forced into plywood. It can cut several sheets at once. The last kind is laser die cutting which uses laser beams for drilling, cutting and welding.