Getting a Gun Blue Finish with Soda Water

Joined
Oct 23, 2018
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So I often use gun blue to finish my axe heads just to prevent surface rust. I was wondering if any of you have used soda water to do the same thing? I have never tried it but a guy I bumped into mentioned it to me and then when I tried to clarify what exactly he meant by "Soda Water" I haven't gotten a reply. Just wondering if someone could clarify what he was talking about and maybe show results? Thanks in advance.
 
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