C-75 is a standard non-stainless carbon steel very comparable to 1075-1080. It will develop a blue-gray patina on the blade over time with use, which is typical and will help protect the blade from rust. You'll want to keep the blade clean and use something to protect the blade like Rust Free. C-75 is made in Germany, and has 0.7-0.8% Carbon, 0.6-0.8% Manganese, 0.15-0.35% Silicon, 0-0.035% Phosphorus, and has a Rockwell of 55-58. This steel is heavily used by Boker.