death in 1996. Reports in 2007 said the painting was sold a decade earlier to the Austrian-born investment fund manager Wolfgang Flöttl. Flöttl, in turn, had reportedly been forced by financial reversals to sell the painting to parties as yet unknown. The Städel hired a private investigator to locate the painting, hoping to show it in an exhibition in 2019. It could not be found and instead the original frame still owned by the museum was put on display empty. Second version There is a second version of the portrait which was owned by Gachet himself. In the early 1950s, along with the remainder of his personal collection of Post-Impressionist paintings, it was bequeathed to the Republic of France by his heirs. The authenticity of the second version has often come under scrutiny due to a number of factors. In a letter dated 3 June 1890 to Theo, Vincent mentions his work on the portrait, which includes "... a yellow book and a foxglove plant with purple flowers." The subsequent letter sent to Wilhelmina also mentions "yellow novels and a foxglove flower." As the yellow novels are absent from the second version of the painting, the letters clearly reference only the original version. Dr. Gachet, as well as his son, also named Paul, were amateur artists themselves. Along with original works, they often made copies of the Post-Impressionist paintings in the elder Gachet's collection, which included not only works by Van Gogh, but Cézanne, Monet, Renoir and others. These copies were self-declared, and signed under the pseudonyms Paul and Louis Van Ryssel, yet the practice has thrown the entire Gachet collection into question, including the doctor's portrait. Additionally, some critics have noted the sheer number of works to emerge from Van Gogh's stay in Auvers, roughly eighty in seventy days, and questioned whether he painted them all himself. Partly in response to these accusations, the Musée d'Orsay, which holds the second version of the Gachet portrait as well as the other works originally owned by the doctor, held an exhibit in 1999 of his former collection. In addition to the paintings by Van Gogh and the other Post-Impressionist masters, the exhibition was accompanied by works of the elder and younger Gachet. Prior to the exhibition, the museum commissioned infrared, ultraviolet and chemical analysis of eight works each by Van Gogh, Cézanne, and the Gachets for comparison. The studies showed pigments