I have been using illustrator for a while now for leaflet and banner printing. My illustrator skills are ok but I have always struggled with colour profiles. All print work I send out comes back slightly different depending on the printer and when I export to PDF the colour always shifts. I always use a colour profile and I include it when I export but still I get problems.
I also have a problem when I embed one .ai file in another. Although both have the same CYMK colour they are not the same. Have a look at the attached picture.
The logo in a seperate file has the same CYMK colour as the background in the master document.
Could anyone point me to a good article about colour profiles or something like that.
A good place to start is the articles on Color Management and Managing Color when Printing here: http://www.computer-darkroom.com/home.htm
Although written for Photoshop (CS4/CS3) the Color Management articles give a comprehensive overall description, valid regardless of application.