In 1889 van Gogh painted 3 versions of A Cornfield with Cypresses the version in the National Gallery in London is discussed in the context of van Gogh's approach to the subject. This is followed by sections describing a technical examination and the cleaning and restoration of the painting. The materials and medium used by van Gogh are described in a separate sections. The painting was cleaned with a brush and deionized water and swabbed with white spirit. A second layer of dirt was removed with 1% potassium oleate. Painted edges were reclaimed by using a larger stretcher for the canvas. The surface of the painting was glazed many photographs, electron micrographs table listing pigment mixtures used in the painting references.