Black oxide coating is a chemical process used to blacken ferrous alloys giving them a thin matte black finish which minimizes light reflection. Parts are cleaned to remove oil and other contaminants they are acid-etched to promote adhesion of the oxide coating. This finish is oiled to provide rust resistance. Many fixtures and production tools are finished with a black oxide coating to make them easier to clean as it makes dirt and contaminants more visible. This is the process that is typically used for fasteners used for fixtures and other similar tools like gears. This process is also used for large welded components that are used with wood beam framing for architectural purposes.

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