Bluing vs. Parkerizing
Bluing and Parkerizing are two different types of metal finishing processes. The major difference between the two is that bluing uses heat to form a thin layer of magnetite (a type of iron oxide), while parkerizing uses electrolytes to introduce a thin layer on zinc to the surface of the metal. Parkerizing was first used on small arms in 1905. Bluing was first used on small...