Abstract
Accelerated ozone exposures and real time air exposure were correlated with published outdoor ozone levels. The results showed that ozone represents a major air pollutant causing colorant degradation under the climatic conditions found in Fribourg on the Swiss plateau.In accelerated ozone chamber tests the real life environment is simulated by choosing defined constant humidity, temperature and ozone concentration levels. On the basis of measurements over one year the statistical variation has been determined and the homogeneity of the test chamber was characterized by colour density loss profiles.A set of typical inkjet media/ink combinations has been analyzed using this accelerated test and was correlated to real life exposure over more than one year for different locations in a building. As a part of this work, the average ratio of indoor to outdoor ozone level for different locations was also investigated.Real life and accelerated tests of porous media with dye based and pigment inks were compared. The local climatic conditions for different locations in a building dramatically affected the indoor to outdoor ozone ratio and the real display life of the prints.The reasons for the different sensitivities of the prints to ozone is on one hand the chemical structure of the colorants and on the other hand the different access of the ozone to the colorant influenced by the media structure as well as its chemical composition and the flow properties around the sample.
Published Version
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