Robert Newson makes some magical things to make me read
} > I remind you from Robert's previous mail: 1=red, 2=blue, 3=magenta,
} > 4=yellow, 5=orange, 6=green
} 
} 
} 0-Black, 1-Magenta, 2-Cyan, 3-Violet, 4-Yellow, 5-Red, 6-Green
} 
} CMYK is a subtractive printing model:
} 
}     Magenta (Red  + Blue)  - Cyan   (Blue + Green) -> Blue
}     Magenta (Red  + Blue)  - Yellow (Red  + Green) -> Red
}     Cyan    (Blue + Green) - Yellow (Red  + Green) -> Green

Easier to remember like that:

 1 : single magenta (the reddish tank, alone)
 2 : single cyan (the blueish tank, alone)
 3 : 1+2: magenta and blue : mix of two: a kind of dark blue/violet
 4 : single yellow (the yellow tank)
 5 : 4+1 : magenta and yellow : mix of two: a kind of red/orange
 6 : 4+2 : cyan and yellow : mix of two: a kind of green

The number is a binary encoding of the tank/ribbon to use.

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