 The first and most extensive recorded cleaning, revarnishing, and touch-up of the "Mona Lisa" was an 1809 wash and revarnishing undertaken by Jean-Marie Hooghstoel, who was responsible for restoration of paintings for the galleries of the Musée Napoléon.The work involved cleaning with spirits, touch-up of colour, and revarnishing the painting.In 1906, Louvre restorer Eugène Denizard performed watercolour retouches on areas of the paint layer disturbed by the crack in the panel.