Historical Painting Techniques, Materials, and Studio Practice

Plate 4a, above. Jacques­

Louis David, 1748 -1825,

The Sisters Zenalde and

Charlotte Bonaparte,

1821. Oil on canvas. The
      J. Paul Getty Museum,
      Malibu (86.PA. 740 ).

Plate 4b, right. Detail Jrom

The Sisters Zenalde and

Charlotte Bonaparte, il­

lustrating the imperceptible

shift from dark to light tones

resulting from physically

blending pigments on the

suiface oj the painting.