Recently HK police use helicopters to spread the UV fluorescent substance shown in the picture to people who are joining a protest. I would like to know what may this substance be and is there a simple way to remove it from the skin/clothes? And, is that toxic to human?5yr ⋅ koisuruwakisei ⋅ r/chemhelp
This is the only facility for kids to play in this playground6yr ⋅ koisuruwakisei ⋅ r/mildlyinteresting
