Abstract
It must be remembered that the exercise described in part 1 was carried out in a carbon arc weathering machine to provide a stable environment. Referring to Fig 7, which shows the absorption spectra of the resins used in this section, it can be seen that the acrylic resin only absorbs to any great extent in the UVB region, and if reference is made to Fig 3, where the spectra of carbon arc radiation and UK summer sunlight are compared, it is seen that the carbon arc is deficient in this area. The protective aspect of titanium dioxide will thus not operate in this weathering environment. If the same exercise was repeated in natural sunlight, then the pigmented paints would show an even greater protective tendency, since all resins absorb to a greater extent as wavelength decreases, but the extent of photocatalysis remains constant. In Fig 7, the two alkyd/MF systems have been represented by a single line because of their chemical similarity.
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