Methods for determining overall print permanence or image stability for digital inkjet and thermal photographic prints have been well defined and are used to represent typical “long-term, home storage conditions” for consumer prints. What these methods do not take into consideration are instances where a consumer might accidentally spill substances onto unprotected prints resulting in unwanted staining. Typical substances can range from high staining materials such as coffee to lower staining materials such as milk. In these instances, stain resistance could certainly impact the long-term preservation of consumer prints. To date, the only existing international standards for this type of image degradation include an ASTM procedure for stain resistance and an ISO procedure for water resistance. This paper will discuss the importance of considering stain resistance as part of long-term image permanence criteria for digital consumer color prints and shortcomings associated with the current international standards. In addition, supporting data from several digital inkjet and thermal imaging systems using a variety of staining substances will be discussed.
Kristine B. Lawrence, Deborah L. Cigna, Wendell J. Brattlie, David Erdtmann, Joseph E. LaBarca, "Stain Resistance as Part of Image Permanence for Consumer Digital Inkjet and Thermal Imaging Systems" in Proc. IS&T Int'l Conf. on Digital Printing Technologies and Digital Fabrication (NIP23), 2007, pp 721 - 727, https://doi.org/10.2352/ISSN.2169-4451.2007.23.1.art00051_2