Why there are 4 different coloured dots on the bottom of a newspaper?
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Those colours are called CMYK (cyan, magenta, yellow and black), the base colours for all colours used in printing. Basically any colour can be obtained by using these in correct proportions. Plates of all these colours are laid out on a page separately and lined up in the same spot while printing. This is necessary to print a full colour image accurately. If the images are somehow blurry and not crisp enough, you will find the colours overlapping or not in the same line.
This is easier to identify through what printers call "registration marks", and thus they can find printing errors easily...
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The four dots blue (cyan), pink (magenta), yellow and black are registration marks used during printing to help ensure the print is aligned properly. In offset printing technology, which newspapers use, the inked image is transferred from a plate to a rubber blanket, then to the printing surface.
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