My tattoo artist (Miya Bailey, City of Ink founder Atl,Ga) doesn't like them. He says they are still unsafe for most people. If memory serves me right, they leave a slight white tint. No one at my shop uses it to my knowledge only scratchers or hipster tattooist. I'd pass on it. How often would one need to be under a blacklight for that time money & pain to be worth it? Better question is why would one be under a blacklight enough to validate aforementioned time money & pain?