Zayn must have seen our piece about that cool UV Harry Potter tattoo because he went and got one for himself.The ex-Directioner has a lightsaber on his middle finger. It looks normal, like nothing special. But then you wave a UV light over it and bam, that sucker lights up blue.Artist Jon Boy, a big believer in UV ink, posted the image to his Instagram Thursday."I've been in the business for over 16 years. I remember when UV first hit the market. At the time, it was fairly new so people were a little iffy about how safe it was," Jon Boy says of the potential health hazards of UV ink. "I've had mine for years. I recommend it."We hope he’s right, because Zayn’s middle finger health is at stake. If something bad were to happen, Zayn would be flashing a seriously messed up digit when trying to flip people the bird. And we can’t have that.Check out the ink below.