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| Images copyright MARVEL COMICS |
I'm assuming that whoever coloured the interiors of The X-MEN #4 didn't do the cover as well, else it's a bit strange that the costumes of QUICKSILVER and The SCARLET WITCH don't match up. Green for WANDA on the cover instead of scarlet, and a mercury-blue for PIETRO instead of green. Almost the same thing was repeated on the next two covers - I say "almost" because Wanda's cossie was right on #6, but not Pietro's. Funnily enough, a few years later, as a member of The AVENGERS, Pietro's costume became that same silvery-blue.
The cover above is a scan of the actual published issue, the one below comes from a MARVEL MASTERWORKS volume. I think the slight differences in hue can be attributed to the different printing processes and paper used, rather than the way they've been coloured. Besides, there could sometimes be a colour variation between copies of the same issue back in the '60s & '70s, due to the vagaries of printing.
Below is a side-by-side view for easier comparison. (Click to enlarge.)