I have been meaning to do this for a long time, so these pots finally are "marked" with a QR code I crated then made a silkscreen of it and can put this little message on the bottom of my pots (put on greenware) --underglaze through silkscreen. I have some other ideas to use these QR codes on my ceramic also. Stay tuned. You can create your own QR coded message in several places on the internet. And, of course, if you have a smart phone with a QR reader app you can read what it says.