"Black", as in the skin color, is not an unnatural coloration. And yes, I'm quite aware that there's a massive range of skin tones in the racial pallette, and that some get very dark. I'm also aware that there's racism in just about every part of the world toward people with darker skin in general, and that it's a systemic problem that spans pretty much every culture.
That, however, was not the coloration they used in the ad. The woman is made to explicitly look unnatural - it's clear the color is a combination of makeup/CG/photoshop. (The apple is a very good comparison.)
If you think I was being racist, check yourself.