When the seemingly blue ink is intentionally sprayed on a friend's body, you will see a disheveled look on the friend's face, and the color will disappear completely after a while. It is suitable for any fabric.
It looks like ordinary ink, you can pretend to accidentally spill it on your friend's light-colored underwear, hehe, he will be very angry and go crazy. Just when he was about to burst into rage, you asked him gently and gently: What did I just do, why are you angry? When he looked at the ink stains on his clothes, it had already disappeared without a trace, leaving no trace. Then you can see his reaction! Hehehe, you can play many times with a little bit, but don't spill a whole bottle on others!