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  • 1 National Accelerator Centre P.O. Box 72 7131 Faure (South Africa)
  • 2 McGregor Museum P.O. Box 316 8300 Kimberley (South Africa)
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An exfoliated fragment of a rock painting from Lesotho was analyzed by differentiated backscatter spectrometry to obtain the paint thickness, which ranged from about 2 to 6.5 m, and its empirical formula for stopping power calculations. Elemental composition was determined by PIXE. Fe-rich paint spots were red in color and Ca-rich ones, pinkish. Because of the chemical mobility of calcium, this paint component should become the focus to which conservation techniques should be directed.