In 1871, Woltmann was among the team of art historians (the others including Moritz Thausing, Carl von Lützlow, Adolf von Bayersdorfer, Friedrich Lippmann, Wilhelm Lübke, Bruno Meyer, Karl Woermann, G. Malsz and Wilhelm Bode who convened in Dresden to determine which of two versions of Hans Holbein the younger's Meyer Madonna was the autograph work.