Document Examiners compare the appearance of the different sheets of paper to try to determine if any look different.
This is a very subjective analysis.
We scan and measure the spectral optical properties of the paper of a known page or reference.
We then scan and compare the other pages to the known reference.
We statistically analyze the data to determine if the paper is the same or not.
We utilize CIE-L*a*b* international standards for the measurement of color space.
Document Examiners then try to compare the sheets using a black light.
This may work on some sheets, but again isn't scientific evidence.
The special software compares the optical properties of the individual sheets and indicates a pass/fail from our calculated criteria or tolerance.
We also obtain a graphical representation of the test data as shown in these two graphs.
What was guess as to which page or pages were different?
ScanRite Paper ID Technology was able to determine that sheets 1, 3 and 5 were from the same source of paper.
Pages 2, 4 and 6 were from a different source than pages 1, 3 and 5.
If fact, pages 2, 4 and 6 are actually each from individually different sources of paper.
ScanRite Paper ID Technology provided scientific evidence to determine which sheets are from the same or different sources of paper.