as a note - I was able to print directly on the holograms - I did the first bits (first 8 chars of the btc addy) to help identify the correct address for the coins - I also did another 40 with SN to match to a list of addresses for the owner.
point being is that you can print onto the holograms. At least with a laser printer.
that's wonderful, I had planned to create the address in the qrcode on a small layer of plastic and put it on top of the coins, but too expensive for a few coins I have.