Corten steel appeared in the middle of the nineteenthirties and was used prevalently in the field of heavy carpentry or in the realization of sculptures. More recently it has become more appreciated in the field of architecture for its material and chromatic characteristics as well as its structural resistance. Technological innovation and the capacity to interpret the latest trends in modern-day architecture led GNEE to be the first to introduce corten steel in the manufacturing of windows and doors: the elegant, high-performance profiles of the 12 product lines, complete with accessories, are realized also in corten with the finish and chromatic effect desired by the customer. Special alloys with copper, chromium and phosphorus, these corten steels have the property of self-protection with a patina on the surface which prevents corrosion from spreading. The natural process of oxidisation can be accelerated by means of specific oxidising baths: this results in a material with a rough, porous surface and warm tones, re-evoking past eras.