I have some transfer paper that has 6 blue vertical lines down the back, Does anyone know who this actually comes from. I've called Costal, Best Blanks and several others with no luck. I had a customer return it to us saying it didn't work, (we sell a different brand this customer is very confused), I did test the stuff sent to us and yes it does work. And with a hand iron even. Any help has to the origin of this paper would be greatly appreciated.