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Reciprocity Behavior in the Light Stability Testing of Inkjet Photographs

Accelerated light stability tests employ highintensity illumination sources to speed the fading process and have been based on the assumption that light fading and light-induced staining reactions follow the reciprocity law; that is, for equivalent klux/hour light exposures, the amount of fading, changes in color balance, and development of d-min stain will be the same in accelerated light stability tests employing high-intensity illumination (e.g., 35 klux for 24 hours per day) as it is under low-level, ambient display conditions (e.g., 450 lux for 12 hours per day) as long as the temperature and relative humidity conditions are the same in both cases. In this ongoing, long-term study, reciprocity behavior is evaluated using high-intensity 35 klux illumination and lower-intensity 1.0 klux fluorescent illumination. Both test environments are maintained at 24°C and 60% RH. Dye-based and pigmented inks printed on various types of inkjet photo media are included, along with representative traditional color and black-and-white photographic prints made with RC (polyethylene resin-coated paper) supports. Potential problems in the design of reciprocity behavior tests for inkjet materials and interpretation of data from these tests are discussed.