You may be surprised to learn that when the jewellery brochure above was printed, all the colours - from the deep green and burgandy backgrounds to the delicate skin tones of the model - were created by combining just four different inks:
C - cyan
M - magenta
Y - yellow
K - key (or black)
CMYK is the colour model used in full colour printing (which is also referred to as four-colour printing and process printing). By overlaying various tints of these four inks it's possible to reproduce a vast range of colours.
If you're interested in the science click here..