Coated paper printed with black indigo shows marked crazing or fold cracking as it is known in offset printing. Photographic paper (silver salt) exhibit a magenta line in the fold after being turned umpteen times. E-PHOTO paper (Felix Schoeller Digital Media) printed with indigo exhibits neither crazing nor magenta crazing according to the findings gathered by Felix Schoeller Digital Media.PTS has been commissioned to develop a standardised method (PTS Craze Test) and to conduct it on three paper samples in order to determine the differences in the crazing behaviour of paper used in the photo album sector. This method must be conducted under pre-defined conditions and serve as certification of the above-mentioned problem area by virtue of its reproducibility.
Dirk Fiedler, Petra Behnsen, Yvonne Gierth, Wolfgang A. Schmidt, "New Craze Testing Method" in Proc. IS&T Int'l Conf. on Digital Printing Technologies and Digital Fabrication (NIP30), 2014, pp 277 - 280, https://doi.org/10.2352/ISSN.2169-4451.2014.30.1.art00067_1