CMYK is the printer raw color~ They r Cyan, Magenta, Yellow & Black!
Normally the Black color No. is C0+M0+Y0+K100, this method called overprint.
Overprint method is just print the black layer, the color will a bit reddish, so will + C 30-40 .
Photoshop has set the black color for printing is C75 M68 Y67 K90, because the original color of photoshop is RGB, It base on LAB system. Black in RGB & LAB r both 000. The singe layer is well being a print out. so that
photoshop set the black in C75 M68 Y67 K90, in order to let the print out have more layer and looks more nice. Also in order to invisible the reddish, C is more ~30. Printing little words in multi layer is easily print in a wrong place. So that C just +30 is enough to cover the reddish and reduce the wrong print.
I find a print out which is printed in CMYK, they usually print in separately.
the missing color can be easier find out in separate layer.
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