Review on 🕵️ Invisible Blacklight Christmas Thanksgiving by STENDA: Enhancing Searchability and Visibility by Freddie Newton

After 2 uses the pens seem to work well. If they're in the right sunlight you can tell there are letters there, but I think that's just because I knew the letters were there. For this video, the light would turn itself off and then back on, but it wasn't a problem the first time I used it. It's fun to use them.