Giacomo Ciamician (1857-1922) was a pioneer in the study of photochemical reactions and their applications. However, at the time, the light sources in the scientific laboratories were too weak to conduct meaningful experiments. He therefore had to use sunlight for his researches. To this end, he used a terrace of the Institute of Science of the University of Bologna. In this picture, dating from the first decade of the 20th century, he inspects the flasks that contained the organic substances whose light induced transformations he wanted to study together with his friend and collaborator Paul Silber (1851-1932).
