The well-known painting "The Kiss" (1859) by the painter Francesco Hayez hides a reference to the Italian tricolour. Beyond the romantic subject, the work has a historical and political significance: Hayez, through the colours used (the white of the dress, the red of the tights, the green of the lapel of the cloak and the blue of the woman's dress), wants to represent the alliance that took place between Italy and France through the Plombières Agreement (21 July 1858), of a secret nature, which were the premise of the Second Italian War of Independence.