This is UV ink on normal white paper, with a drawn white, of course the marker pen is 2mm tip . You can use your phone with a QR code to read by looking at this picture. It is my email address as a sample. The edges are not sharp, but my cell phone still reads after a couple seconds. I think this is good enough to proceed to the next step which is printing UV ink through an inkjet printer so the code is sharp and readable from afar.