Artnet: The Top 10 Biggest Art Discoveries in 2015: RECENART and the Monet analysis

6. Researchers find Monet's hidden signatureResearchers at Finland's University of Jyväskylä used a hyperspectral camera and an XRF device to uncover Claude Monet's signature obscured under a layer of paint in A Haystack in the Evening Sun. Until now, researchers have been skeptical of the authenticity of the 1891 painting due to the missing signature.