It's supposed to be tough it was very sharp ootb someone put a good edge on it. Surprised for such a inexpensive blade. Cutting protein started bluish patina, but also had a few brown spots peeling melons & pineapple. Forced a patina for protection. At work new knives would form patina quickly cutting anything & everything for hours a day never worried about rust. Just wash warm soapy water & dry completely end of shift. Home use different. I actually oil some knives that might not be used for days at a time. It's a great pineapple peeler.