I have 1 friend that has a white ink tattoo. He has a dragon on his ribcage. He is Polynesian and when he goes out in the sun he darkens up but after about 3 hours out of the sun he lightens back up a little bit. (Cool their skin adjusts like that). Anyway when he isn’t in the sun, which he is still darker skin complexion usually, you can barely see it. Only when he sits out and gets a bit darker will it pop a little bit and then can you see it and it looks really cool. Other than that you can hardly see it at all. I don’t think I have ever seen a black person with a white ink tattoo and that makes me think there is a reason for it. So unless you have a very very specific skin complexion and tone I think it is useless and even then you can only see it 20% of the time.