Inkjet printing of photographs using both dye-based and pigmented inks has become the most popular form of output from digital camera files. In addition to desktop and wide-format applications, inkjet printing technology is now also being adopted for “dry” minilabs and by professional portrait and wedding photography studios. Various factors affecting both light-induced and thermally-induced yellowish stain formation in inkjet prints are described. Stain behavior for representative inkjet papers as well as for selected traditional chromogenic (“silver-halide”) color photographs are discussed. Using data obtained from high-intensity 35 klux tests, potential stain formation and fluorescent brightener activity loss reciprocity failures are described. Problems with the integration of light-induced and thermally-induced yellowing data in accelerated image stability tests are also discussed.
Henry Wilhelm, "Yellowish Stain Formation in Inkjet Prints and Traditional Silver-Halide Color Photographs" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP19), 2003, pp 444 - 449, https://doi.org/10.2352/ISSN.2169-4451.2003.19.1.art00106_1