Abstract
RECENT experience has shown that certain grades of zinc oxide of local manufacture markedly accelerated the initiation of chalking in paint films. In the course of an investigation into these differences, it was observed that they corresponded to differences in the fluorescent behaviour of the zinc oxides when irradiated with ultra-violet light. The zinc oxides (Series A, three samples from two manufacturers), prepared by burning zinc vapour in air (French process), showed no visible fluorescence at room temperature and markedly accelerated the initiation of chalking, as compared to the zinc oxides (Series B, four grades from three manufacturers) prepared by burning zinc vapour in air containing reducing gases (as in the American process), which showed a strong yellow fluorescence.
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