"bluing, which is another electrochemical conversion coating". Do you mean at the molecular level? Because all the bluing I have ever seen or done is just dunking the part into a boiling solution with certain chemical salts in it. No electricity is applied like is done with say nickel plating.
There are also other bluing methods like rust bluing which is a controled rusting process and carbonia bluing which is done solely with heat. Again, no electriciy. Not trying to be picky here! Just to clarify.
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