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I have a white background, on top of that a black vector shape (A), and a white vector shape on top (B). I have B on difference blend mode. My goal is that both shapes appear black, but that the area where B overlays A prints white. In case someone doubts, I'm using CMYK.

My problem is the following: the area I want to be printed white is light gray. If I set A to registration black it shows how I want it to be, but I have to print it, and part of A is shown. I don't know how to archive what I have in mind.

I know I could probably divide it into three basic shapes instead of using blend modes, but I would prefer doing it this way, so I can easily resize or move the shapes.

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I'm not sure you can achieve this in Indesign.
I personally would use Illustrator instead. No blending, only pathfinder's exclusion. See example below:

enter image description here

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