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I'm not sure how much sense the title makes, so I'll explain further:

I've got some black text that, at one point, goes over a black shape. Obviously, this means you can't read the part of the text that goes over that shape. I was wondering if there was a way to have only the part of the text that passes over the black part to change colour. So when my black text is overlapping with the black background, it turns white? I get the feeling you can do this with blending somehow, but any help would be appreciated!