The people who tought you to use Quark should have told you these basic facts:
1. You can NEVER and under no circumstances see anything on a monitor but RGB. RGB is a color mode, and in that color mode you have several working spaces, like SRGB and Adobe RGB. CMYK is typical for printers using ink, varying from professional offset printing presses to dekjet printers at home.
2. When Photoshop or any other app has to display CMYK on the monitor, it acts as if, and gives an approximation. The way it converts is by using the LAB color mode.
3. Because of the very limited number of hues that can be made with CMYK, so-called "spot" colors are created. These are pre-mixed inks, or inks that can be mixed from a basic set of ink colors. One of the better known sets is the pantone set. Because these colours serve to expand the CMYK range, there is NO WAY to print them using CMYK. The only way is to choose them in the Pantone Range guide books. It is also very important to choose the book that corresponds with the kind of paper one wishes to use as colours vay a lot on different papers.
So spot colors cannot be used or rendered on deskjet printers.
Pantone also has a book that shows the CMYK color that approximates most the different pantone trumatch colors. Once you have taken a brief look at this, you will never again try to print spot colours with CMYK And the professional printers with whom you work will be happy because for once they get a work that they don't have to change all the way.
If you want to work with professionals: be professional, and know your basics!
