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.
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.