Reply To: Overprint Issue

Lynda
Proper trapping of black text on a colour background is for it to overprint.
Text is usually too small to trap (knock out, choke and spread) and would lead to problems when printing.
You will get a rick black which is correct, you will not be able to see this colour in bodies text as it is too small.

If you want the seps to look more correct then set the black text in Illustrator to overprint before you save it.

As to the original question your prepress/printer will add their own trapping to text and will usually over ride you settings to make sure they are correct for their print process. Workflow systems (Prinergy, Apogee, XMF, Esko etc) will apply trapping as part of the press press along wiht colour management.
So the separations you see inInDesign are not always the same as what the printer will end up using.