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This question already has an answer here:

I am having issues with objects overlapping.

If I create a red rectangle in Illustrator, then copy it, and paste it directly on top of itself and change it to white, I get a red outline, even though the object is supposed to cover the other object behind.

Why is that? It's driving me nuts, please someone help me out :)

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marked as duplicate by Scott, Darth_Vader, ckpepper02, Benteh, TunaMaxx Jan 16 '14 at 18:26

This question was marked as an exact duplicate of an existing question.

My guess is that you see the red outline because the zoom level in relation to the shapes sizes doesn't match up, and therefore you get a "ghost boarder" of the underlying shape. If you press Command + 1 (Ctrl + 1 on Windows) which zooms you to actual size of the document then the boarder should not be visible (As long as the shapes you have are of the EXACT same size).

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