Anonymous ID: 8b23dc Nov. 4, 2020, 7:04 a.m. No.11455758   🗄️.is 🔗kun

>>11455638

Smart water? "Watch the water".

 

Genius. I used to work for a company that made invisible IR and UV marker pigments for security documents and banknotes. The wavelength can be really tight too, to prevent counterfeiting.