A symbol of Sardinia’s proto-industrial archaeology. The tanning tradition of Bosa dates back to ancient Rome, maybe even before that. Rediscovered in the 17th century, it grew until it became a very successful business, from the second half of the 19th century throughout the first half of the 20th century. About thirty companies were active, which left memories in sas Conzas, appearing in a line along the left margin of the Temo, near Ponte Vecchio. For almost a century, the centre of the Planargia was Italy’s tanning capital, with top-quality products that were highly appreciated and sold both in Italy and abroad. The business gradually slowed down over time, and finally stopped in the second half of the 20th century.