actually i have a theory about the reddit flash way:
i have noticed that in most cases laser toner is much less translucent that inkjet ink, so if the wallet was printed with a cheap color inkjet printer, and then the codes added with a laser one (seen it recommended for durability purposes) it's possible that such difference is enough to render useless the obscuring pattern when a bright enough light is used
update:
i managed to reproduce the effect on a wallet printed on inkjet in one go, but sadly my phones camera is unable to photograph any detail at such light conditions, but ill explain in detail:
first thing is slightly pressing on the sides to separate the layers, so the light of the front obscuring pattern gets scattered before reaching the qr, so you will need to make the 3rd fold separate from the first two, which is actually quite harder than separating the first one, so you need to make a fold like this:
http://img42.imageshack.us/img42/5965/wt01.jpgUploaded with
ImageShack.usmake sure you don't make it like this:
http://img59.imageshack.us/img59/9770/fvwz.jpgUploaded with
ImageShack.usand it should end up looking like this:
http://img850.imageshack.us/img850/3296/6qcr.jpgUploaded with
ImageShack.usnotice the small creases that show that it seems to be "inflated".
front:
http://img9.imageshack.us/img9/7899/a61k.jpgUploaded with
ImageShack.usnote:i used duck tape because i was doing several tries and it was easier and cheaper just using duck tape.
in case there is the slightest gap between the edge off the tape and the edge off the fold you can insert a needle and it will make it much easier, so never make any wallet like this:
http://img12.imageshack.us/img12/344/j3jw.jpgUploaded with
ImageShack.usbut alternatively you could just pierce a small and discrete hole on any crease and do the same
continue in next post...
