Lithography
The mining and metallurgical company Peñarroya is a French company founded in 1881. Initially established in Spain at the Peñarroya-Pueblonuevo site, it expanded into many countries by specializing in non-ferrous metals. The poster concerns the superphosphates and fertilizers marketed by the company.
One of the first powdered detergents that releases hydrogen peroxide at 60°C to whiten laundry.
Children's biscuits made by the biscuit factory Les Desserts Coquin in Sainte Savine near Troyes.
A preparatory drawing was most likely made.
