Wilhelm Leibl (1844-1900), Wastl, around 1882, Graphite, Wallraf-Richartz-Museum & Fondation Corboud

Wastl, Counterproof of Leibl-drawing, Graphite, around 1882, Wallraf-Richartz-Museum & Fondation Corboud

Juxtaposition of drawing and counterproof, Wastl, Wilhelm Leibl, montage, Wallraf-Richartz-Museum & Fondation Corboud

Jean-Baptiste Le Prince (1733-1781), Study of a Seated Boy, red chalk, Wallraf-Richartz-Museum & Fondation Corboud

Study of a Seated Boy, counterproof of a drawing by Le Prince, red chalk, Wallraf-Richartz-Museum & Fondation Corboud

Female Nude and Study of a Woman, counterproof of a drawing by Antoine Watteau (1684-1721), red chalk and black chalk, Wallraf-Richartz-Museum & Fondation Corboud

Louis Claude Vassé (1716-1772), Design for a vase, Red chalk, grey pen, wash, Wallraf-Richartz-Museum & Fondation Corboud

Jean-Baptiste Le Prince (Metz 1733-1781 Paris), Study of a Peasant with Child at Play, red chalk, Wallraf-Richartz-Museum & Fondation Corboud

Study of a Peasant with Child at Play, counterproof of a drawing by Le Prince, red chalk, Wallraf-Richartz-Museum & Fondation Corboud

Johann Anton de Peters (1725-1795), Standing Female Nude, Red chalk on top of traces of squaring in black chalk, Wallraf-Richartz-Museum & Fondation Corboud

Standing Female Nude, counterproof of a drawing by de Peters, Wallraf-Richartz-Museum & Fondation Corboud