After 126 years, a lost sketchbook by Vincent van Gogh was revealed to much fanfare worldwide Tuesday — thanks to a Canadian art expert — but not everyone is convinced of its authenticity.

Canadian art historian Bogomila Welsh-Ovcharov’s Vincent van Gogh: The Lost Arles Sketchbook contains many drawings from the most significant period of van Gogh’s life, when he was living in the south of France, working on some of his most famous paintings but suffering from the psychological torment that led him to cut off his ear and spend months in hospital while continuing to create.

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However, as Welsh-Ovcharov launched Vincent van Gogh: The Lost Arles Sketchbook at press conference in Paris Tuesday morning, the Van Gogh Museum in Amsterdam released a statement disputing the authenticity of the sketches.

The museum states their own experts examined some of the sketches and concluded they are imitations of van Gogh drawings, calling them “monotonous, clumsy, and spiritless.”

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