Plate 30. Cross section from Baptism,
near an edge: layer 1 (at the bottom), in
termediate white layer, here thicker; layer
2, pink layer with madderlike particles;
layer 3 (on top), white with natural ultra
marine. Photograph by]. R. J. van As
peren de Boer.Plate 31. Paint cross section, light green
Joliage, upper part oj central trees. Work
shop oj Jan Bruegel, Noah's Ark. Layers
Jrom bottom: (1) chalk ground; (2) impri
matura: red and black in a translucent me
dium; (3) sky: white lead, pale smalt,
black; (4) Joliage underpaint: azurite,
earth, white lead, black. Magnifrcation on
35 mmfilm: X64.
Plate 32. Paint cross section (dark sky at
upper edge) from Esaias van de Velde's
Winter Landscape. Layers Jrom bottom:
(1) ground: chalk with white lead, earth,
and black; (2) sky: white lead, smalt, and
earth black; (3) darker sky: smalt and
white lead; (4) overpaint. Magnifrcation
on 35 mm film: X70.