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Process Inks, Colours, Printing
In printing subtractive primary colours are used, meaning that if you have an absence of all of the colours (of ink in this case) white (or paper colour) is seen. In anything based on light to create colours, additive primary colours are used, when all the primary colours of light are added together white is produced. The additive primary colour of light are red, green and blue. The subtractive primary colours are cyan magenta and yellow. Black is added in printing for practical reasons, and to add a darker shadow tone.