Model experiments using a flow photoreactor (Hgimmersion lamp) connected to a spectrophotometer are useful to study the influence of the state of dye aggregation and of certain addenda on lightfastness. Such experiments can be carried out in the transmission- or in the diffuse reflectance
mode (ULBRICHT integrating sphere), the latter being useful for diffuse particulate systems with agglomerates of AlOOH nanoparticles. Such measurements can often be correlated with results in ink-jet receiving layers. Parameters like humidity, temperature, solvents, polymers etc. in ink receiving
layers or in inks are shown to influence photolysis by the state of dye aggregation.While we could show that a
Rolf Steiger, Pierre-Alain Brugger, "Photochemical Studies on the Lightfastness of Ink-Jet Systems" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP14), 1998, pp 114 - 117, https://doi.org/10.2352/ISSN.2169-4451.1998.14.1.art00028_1