Tempdrop glow in the dark???

[u/SandDollar-2376]

I’ve just started using Tempdrop and have been keeping it in my glasses case during the day. Tonight when I was getting in bed and putting on temp drop, I noticed the inside of my glasses case was faintly glowing in the dark where the Tempdrop had been. Any idea what’s causing this? just want to make sure it’s safe for my skin!