How can I invert colors in Powerpoint slides?

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bdub_24
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My girlfriend wants to print her college lecture slides that she has in .ppt format. The backgrounds of the slides are black, so this will take a lot of ink. I can change the global background color easily by modifying the theme, but there are yellow drawing objects and text that is all over several slides. It would be MUCH easier to handle if I had a way to simply invert all of the colors globally. Any ideas?
 

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