The workers employed at the Roman fulloniche followed a rigorous manufacturing process divided into production stages (pressing, carding, sulphuration and drying), skillfully depicted in a well-known fresco of Pompei. Certainly the most curious activity was that carried out by the fullones who pressed the textiles with their feet (saltus fullonicus) on the inside of small basins divided by low walls, in order to degrease and permeate the textiles with natural chemical substances including urine. According to some scholars the production and commerce of textiles in Florentia was carried out by expert Greek-Asian artisans who lived in a borough near the Arno.