Prevent knockout by using the Overprint options in the Attributes panel in InDesign.
The Best Method for Setting Up Overprint in Adobe InDesign — Fraga
To Overprint or not to Overprint? Black is the Question! – Colecandoo!
Learning Print Production: Photoshop, Illustrator, and InDesign
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The Best Method for Setting Up Overprint in Adobe InDesign — Fraga
Common Printing Issues: Overprinting
The dreaded white box: How to identify overprint issues. - Eagle
Turn on Overprint Preview Before Printing
The Best Method for Setting Up Overprint in Adobe InDesign — Fraga Graphic Solutions, LLC
The dreaded white box: How to identify overprint issues. - Eagle Web Press
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