It is a process of blackening stainless steel parts by chemical means. It is comparable to the traditional burnishing process that is applied instead to ferrous material and cast iron and is done by immersion in an aqueous solution at 130 °C with specific chemical agents suitable for oxidizing the nickel and chromium salts contained in the stainless base material. The process is relatively quick, with dwell time of about half an hour. This is followed by rinsing, drying, and usually oiling, which gives a shinier, more uniform aesthetic.
In order to give fasteners and their nuts a controlled coefficient of friction, an anti-friction product can be made by immersion and centrifugation that can leave a very thin layer, around one micron, of material on the surface of the parts to give a better coefficient of friction.
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