
Lambert Doomer, The Rhine near Mülheim with a view of Cologne, c. 1663, Graphite, with brown and grey-brown wash, on laid paper. Wallraf-Richartz-Museum & Fondation Corboud, Köln, Graphische Sammlung, © Photo: Thomas Klinke, Wallraf-Richartz-Museum

Peter Paul Rubens, Centaur, tamed by Cupid, c. 1606, Black stone chalk, on laid paper. Wallraf-Richartz-Museum & Fondation Corboud, Köln, Graphische Sammlung, © Photo: Thomas Klinke, Wallraf-Richartz-Museum

Govert Flinck, Study of Two Sitting Female Nudes, c. 1648/52, Black chalk, heightened with white ink, on blue laid paper. Wallraf-Richartz-Museum & Fondation Corboud, Köln, Graphische Sammlung, Permanent loan from a private collection, © Photo: Thomas Klinke, Wallraf-Richartz-Museum

Rembrandt, Christ and the Woman Taken in Adultery, c. 1657/59, Reed pen and brush and iron-gall ink, deletions with the brush and opaque white, on laid paper. Wallraf-Richartz-Museum & Fondation Corboud, Köln, Graphische Sammlung, © Photo: Thomas Klinke, Wallraf-Richartz-Museum

Johannes Wierix after Hans Baldung Grien, St Barbara, c. 1572/75, Pen and black ink over squares in graphite (partially erased) on laid paper. Wallraf-Richartz-Museum & Fondation Corboud, Köln, Graphische Sammlung, © Photo: Thomas Klinke, Wallraf-Richartz-Museum

Frans Snijders, Concert of Birds, c. 1630/50, Pen and brown ink over graphite, with brown, grey and blue washes, on laid paper. Wallraf-Richartz-Museum & Fondation Corboud, Köln, Graphische Sammlung, Permanent loan from a private collection, © Photo: Thomas Klinke, Wallraf-Richartz-Museum

Hendrick Goltzius, Fantasy Head of an Old Man, 1593, Black chalk, heightened with white chalk, on light brown laid paper. Wallraf-Richartz-Museum & Fondation Corboud, Köln, Graphische Sammlung, © Photo: Thomas Klinke, Wallraf-Richartz-Museum

Netherlandish, Loving Couple, Sitting on a Grass Mound, c. 1600/30, Pen and grey-brown ink, traces of black chalk, point of brush and opaque red, brush and yellow and blue-grey watercolour and opaque red, blue and violet, with green-brown wash, on laid paper. Wallraf-Richartz-Museum & Fondation Corboud, Köln, Graphische Sammlung, © Photo: Thomas Klinke, Wallraf-Richartz-Museum

Michiel D. van Limborch, Portrait of a Girl, c. 1650/60, Black chalk, some black ink, over graphite, partially over diluted white, partially heightened with opaque white, opaque highlights in light apricot, touched up with ochre ink, on blue laid paper. Wallraf-Richartz-Museum & Fondation Corboud, Köln, Graphische Sammlung, © Photo: Thomas Klinke, Wallraf-Richartz-Museum

Tobias Verhaecht, Mountainous Landscape with River Valley, c. 1616, Pen and brown ink, with grey, blue and brown washes, traces of black chalk, on laid paper. Wallraf-Richartz-Museum & Fondation Corboud, Köln, Graphische Sammlung, Permanent loan from a private collection, © Photo: Thomas Klinke, Wallraf-Richartz-Museum