The discovery comes as the masterpiece by the Dutch artist is undergoing a long-term public restoration at the Rijksmuseum in Amsterdam

The self-portrait is considered the final major work by the Dutch artist to enter a public museum from private owners—but sparked controversy after it was acquired with public funds during the pandemic

As the Rijksmuseum prepares to restore the Dutch master’s most-celebrated painting in full view of the public, we look at its chequered conservation history