Modalità di estrazione e tracce di lavorazione dell'allume sui monti della Tolfa
Alum is a material to be extracted with peculiar procedures by getting a deep cut in the mountain, adequately supported with props and armor. The traditional working tools remain in use until the permanent closure of Camerali’s factories in the mid nineteenth century, with the only innovative contribution of powder-loaded mines. The start of the construction site, made up of different professionals and efficient infrastructure, was followed by the installation of small groups of houses around the quarries and processing sites.