Fig. 5From: New insights into the materials of fifteenth- and sixteenth-century Netherlandish paintings in the National Gallery, LondonGerard David, Canon Bernardijn Salviati and Three Saints (NG1045). Paint cross-section from dark brownish-green leaves on the tree at the top left, showing some blue–green lath-like particles of copper sulphate, and a more tabular green particle towards the right of the sample. Images © National Gallery, LondonBack to article page