I'm about to order some for the kitchen. They look to be a good value. Grand pa made some knives like these out of old saw blades and they are still going strong. The blades form a natural dark oxidation layer that helps to protect the steel. If the blade is polished steel all you need is a little flitz to keep it shinny. Personally I don't worry about stained kitchen knives it's really not a big deal. Stainless steel has been around for a hundred years carbon steel a couple of millennia.
Let a man never stir on his road a step
without his weapons of war; for unsure is the knowing when need shall arise of a spear on the way without.