Brand New Dorco Double-Edge Safety Razor Each one of the razor blades has been coated using platinum, a precious metal oft-used for both its resistance to rust and its outstanding hardness. Both factors are useful in ensuring that each Dorco razor blade lasts as long as possible, so as to provide the most value possible to the customer. Despite the emphasis on prolonged usefulness, Dorco razor blades are also sharpened so as to provide smoother and less irritating shaves.