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Original scientific paper In this paper the research results of the weather resistance of the Ink Jet wide format prints obtained by piezoelectric technology with pigment-based and UV curable inks are presented. The samples were exposed to the real outdoor conditions. Changes in the optical characteristics of the substrate as colour difference and gamut volume of prints in relations to the global and diffusion radiation, air temperature and humidity are presented. The results show that ΔE* for yellow and slightly less for the black on prints with UV curable inks exposed in summer is less in the period when gamut volume increases with time of exposure due to global radiation increase. Gamut volume of prints with UV curable inks increases during winter, as well as in the specific time interval in summer to subsequently reducing with further exposing. However, the gamut volume of prints with pigment-based ink is reduced during exposing, and ΔV for daylight exposing is 37 % higher compared to winter.

Stability of wide format ink jet prints for outdoor application