Having come from the traditional side of commercial printing, whilst serving out my apprenticeship, I found this simple demonstration of 4 colour CMYK printing to be pretty useful.
If you've not had the opportunity to work in a printers, or watch a 4 colour printing press at work, it's not always so clear as to how the CMYK process of layering each ink: Cyan, Magenta, Yellow and Black.
This simple GIF: larger version at this link: http://i.imgur.com/DrLJmHf.gifv really does do a great job of showing how each progressive layer of CMYK builds up to the final CYMK composite.
Demonstration of 4 Colour CMYK Printing with Acrylic Slides
I've saved an individual frame, as each acrylic slide is about to be put down, in the images below, starting with Black (often referred to as the letter 'K').
Cyan Acrylic Slide
Magenta Acrylic Slide
Yellow Acrylic Slide
Black Acrylic Slide
Composite of all CMKY Acrylic Slides
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