Hello, i bought iphone case on ebay and they are luminous, they are glowing in the dark after they've been exposed to light for a while (made with addition of phosphor for sure). When i was a kid i had watch with glowing phosphor arrows, and alot of people told me it's a freaking dangerous to my health and they're radioactive etc, etc. Maybe some of here can find me the answer, should i use this case with a phosphor or not.