For anyone who's seen Prometheus, a very similar looking black substance wreaks havoc on everyone in the film (zombification, total DNA destruction, red eyes, itchy skin, you name it). 

At least as the pop star describes it, though, her black liquid won't have any of those effects. 

The packaging explains that the black perfume becomes invisible once it is spritzed onto skin. "First of its kind, this perfume is an innovation in fluid technology. It's black like the soul of fame but invisible once airborne."

But most importantly, what will it smell like? "Tears of belladonna, crushed heart of tiger orchidea with a black veil of incense, pulverised apricot and the combinative essences of saffron and honey drops."

In other words, like aliens.