Reply To: NEWBIE: Black turning to grey

You should really get Acrobat Professional.

Where Reader is free, Acrobat Professinonal is for… well professionals and gives you more control and also allows you to see the Output Preview detailing the amount of ink used in each channle (Cyan Maganet Yellow and Black). And this would help you further track down your issue.

But there's a multitude of things going on regarding the Dark Gray issue. I recommend you take a trip to Lynda.com and look at videos for Colour Management and other related things.