The Jacob Blessing the Sons of Joseph, one of the most important oil painting by Dutch artist Rembrandt van Rijn, is part of an exhibition, going first into the National Gallery in London and then into the Rijksmuseum in Amsterdam. For especial security aspects this artwork has been equipped with the new ArtGuardian Sensor System. A second sensor system was shipped to London two weeks earlier in order to transfer the climate conditions from London to Kassel being monitored by the conservator-restorer in charge Anne Harmssen.