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Jevan Meruga: We need to make this QR code using an Auto-CAD file and then we make it compatible with our printing machine at the School of Mines (and Technology) We start printing with our ink, this is the ultrasonic atomizer we have and we usually use 1ml (milliliter) of ink. It starts atomizing the ink and once we have the atomizer flow value it takes the ink through the pipe and then once we get the sheath it prints the ink through the sheath onto the substrate So far we have successfully printed lines of about 50 microns with the controlled parameters The paper samples that we printed on, we dont see anything, so it is totally covert and the designs are robust This is the 980nanometer laser that we have which has 8 watts of power. So once we excite the QR codes using the 980 nanometer laser they show up in green colour because of upconversion So, this IR (infra-red light) will be upconverted to visible light at 5,000 nanometers wavelength because of the upconverting nanoparticles
