In a previous question about the origin of the term "blue hour", the research from Dietrich Seybold on the blue hour was linked. Seybold claims that Albert Besnard draw a painting called "l'heure bleue" in 1890. He does not have a picture available in his website. How do I confirm such a painting exists? I tried to search in Web Gallery of Art, WikiArt, Paris Musées Collections and other search engines to no avail. My impression is that there was a confusion either with the work of Klinger (...
