THE TORN SLIP AND IT'S HIDDEN CODE
The process used starts with a high-resolution image, we then moved on and applied a technique used in the Art world, Infrared Transmission. A good quality close up image was then taken at an oblique angle and it showed what you see above, but it doesn't become really plain until you rotate the image through 90 degrees and then crop it:
The image above is the first, more on the way...