Stability of phthalocyanine, 1 -nitroso-2-naphthot Fe, Co, and Mn complexes, diketopyrrolopyrrole, and tetrachloroisoin-dolinone used alone and as pigments (0.5 or 1%) in a standard vinyl-acrylic paint, was examd. on a 12-week (June-Sept. 2003) outdoor and indoor exposures in terms of color change detd. by an X-Rite spectrophotometer and pigment's structure change detd. by UV-VIS and IR spectroscopy. Coatings applied to glass conditioned 14 days at 23 +/- 2 degrees C, RH 50 +/- 2%, were exposed to the atm. at Oswiecim, PL. Nondispersed pigments were lit for 168 hrs. with a 280-nm Xe lamp at 55 degrees C and then IR analyzed. In IR terms, the Fe complex was most resistant, and the other pigments were fully resistant, to accelerated aging. The Co and Mn complexes were least resistant to the 12-week outdoor exposure. Most fading were the diketo and the tetrachloro pigments, but the Xe lamp irradiation produced no major structure changes. The color changes in the tetrachloro pigments produced in the 12-week test were invisible to the human eye.