Each Pallarès tool-blade is hand-fashioned from high-quality carbon steel. Carbon steel is harder than stainless steel and will hold its edge longer before needing to be sharpened. It does require a bit of care and attention. It is also natural for carbon steel to develop a patina over time.
Carbon steel makes a harder and stronger cutting blade than stainless steel, it is also easier to sharpen. In return for its high performance, carbon steel will need a little bit of love and care, as it will tend to oxidise if not well maintained.