A new blue process, in easy to use liquid form. Just rub it on. The more you rub, the darker it gets. An exotic Selenium compound, even a beginner will like the results. Blue and Rust Remover won't touch this finish, since it is not an iron oxide. It is durable, and easy to use. Used as a "touch up" blue, because it reacts only with shiny steel, and won't wet or discolor blued steel. Great for screws, sights.