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Why did my dark blue print turn purple after a month in the window?

I printed a batch of 40 posters for a shop in Cleveland back in March, all using a rich CMYK blue with 60% cyan and 40% magenta. After they sat in the south-facing window for about five weeks, that blue shifted to a muddy purple I didn't expect. Could the UV exposure be fading the cyan faster than the magenta, or should I have pushed more black into the mix instead?
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