What settings (Job Options) are you using when saving to PDF?
I've tried illustrator default, press quality and PDF/X-1a:2001
I use two spot colors: pantone 293c and pantone 354c. They are all set to Book Color.
In Illustrator CS4 and Indesign CS4 everything looks fine (overprint preview checked). In Acrobat CS4 everything looks dull. It's better when I use the PDF-profile: ScreenPrintSpot_1v4_IND4.joboptions in Indesign (http://www.gwg.org/index.php?search=&vendor=all&version=all&app=indesign+cs2-cs4®ion=al l&segment=all&color=all&precre=all&res=all&id=9%2C191%2C0%2C0%2C1%2C0).
Is it normal the spot colors look dull in Acrobat. Am I doing something wrong?