Source: Advanced Heat Treat Corp.
Let's talk about guns.
To create a durable and corrosion resistant barrel, guns in the 19th century were made with blackening, a process related to heat treat. This application also increased the general look, reduced light reflection, and increased wear resistance in general.
This best of the web will cover general blackening of ferrous metals and summarize key points about nitriding and nitrocarburizing with blackening.
An excerpt:
"There are three types of blackening in common use: Caustic Black Oxidizing, Room Temperature Blackening and Low-temperature Black Oxide."
Read more at "Decorative and Technical Aspects of Ferrous Metals Blackening"
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