Abstract
The weathering capacity of UV-A, UV-B and UV-C radiation (i.e. long, medium and short wave) was tested on granite, rhyolite and biocalcarenite samples and glass slide supports coated with silver, black, blue and red graffiti paint. Physical and chemical changes occurred in the red, blue and silver paints, but not the black paint. Red and blue paints appeared be sensitive to UV-B and UV-C radiation, and they were not altered by artificial daylight or UV-A radiation. By contrast, all three types of UV radiation caused chemical changes in silver paint. Unexpectedly, physical changes in the paint and photodegradation were not correlated.
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