Make sure overprint previewing is on in Adobe
Acrobat (Advanced > Overprint
Preview).
Using the Select Objects
tool ,
select an object.
Choose Window
> Show Enfocus
Inspector or click the Show
Inspector button
to display the Enfocus Inspector.
Select the Fill and Stroke >
Overprint category.
Change the Fill or Stroke overprint
settings.
= on
= off
If necessary, select an Overprint Mode: OPM 0 or
OPM 1.
Note: You will only see a difference between the overprint
modes if you turned the Adobe Acrobat overprint previewing on, as described
in step To change the overprint settings of an object.