Photochrom, also called the Aäc process, is a process for producing colorized images from black-and-white photographic negatives via the direct photographic transfer of a negative onto lithographic printing plates. The process is a photographic variant of chromolithography, a broader term that refers to color lithography in general.
Rome is the capital of Italy and of the Lazio region. In 1861 Rome was declared capital of Italy even though it was still under the Pope’s control. During the 1860s, the last vestiges of the Papal States were under French protection, thanks to the foreign policy of Napoleon III. It was only when this was lifted in 1870, owing to the outbreak of the Franco-Prussian War, that Italian troops were able to capture Rome entering the city through a breach near Porta Pia. Afterwards, Pope Pius IX declared himself as prisoner in the Vatican, and in 1871 the capital of Italy was finally moved from Florence to Rome.
