Greenish-blue color used in color printing: along with
Magenta,
Yellow, and
Key black. According to some, black ink is called
K (key) because the four colours are aligned with the key of the
black key plate, the plate that contains more details to be printed. According to others, the K comes from the last letter in
black and was chosen because B already means
blue: but
blue is not a primary colour,
cyan is
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