Fig. 4From: Congregation leaving the Reformed Church in Nuenen by Vincent van Gogh: a combined multi-instrumental approach to analyse the painting’s stratigraphy in support of varnish removalOCT results collected at spots OCT15 (a) and OCT21 (b). White lines in the macrophotographs mark the exact location and direction of the OCT tomograms. Layers visible: (1) initial paint layers from 1884, (2) Van Gogh’s initial varnish from 1884, (3, 3a) Van Gogh’s painted addition from 1885, (4) later, non-original varnish layer(s) from the 1961 restoration treatment. Yellow arrows mark the discontinuity of the paint layerBack to article page