The carte-de-visite did not catch on until one day in May 1859 Napoleon III, on his way to Italy with his army, halted his troops and went into Disdéri's studio in Paris, to have his photograph taken.
<Context ref.>A History of Photography, by Robert Leggat [En línia]. [Consulta: 2 juny 2006]. Disponible a: http://www.rleggat.com/photohistory/welcome.html