The majority of our knives will stay looking as new, however our Carbon Steel knives will require a bit more TLC. These knives will need to be dried off after use as they do oxidise/rust if left wet and over time the edge will form a patina (a green/brown film caused by oxidisation). Drying them straight after use will prevent them from badly rusting but the blades will never stay looking brand new. The patina that will appear on the blades over time is a natural protective layer that protects the blade from further oxidastion.