Bob Ouellette 73 Posted January 5 Share Posted January 5 The recipient of my 8" chefs knife I made recently asked if I can make a knife with a black blade I have a couple ideas of how to do it, but I don't know what's best. I could do a baked on oil finish, like seasoning a cast iron pan or one of any number of recipes of hot blueing. What are your thoughts? Link to post Share on other sites
brian_newberry 11 Posted January 5 Share Posted January 5 Boil the blade in apple cider vinegar. Assuming a carbon steel blade. 1 Link to post Share on other sites
Joël Mercier 525 Posted January 5 Share Posted January 5 A short dip in ferric chloride, then you wash off the oxides and put the blade in a jar of super strong instant coffee for at least 12h. 1 1 Link to post Share on other sites
Paul Carter 43 Posted January 7 Share Posted January 7 I just do the super strong instant coffee for an hour or two to make a carbon steel blade black. If you polish it first, it comes out a nice shiny dark gray. Adding some lemon juice to the instant coffee will cut the etch time required by 1/4 the time it takes in coffee alone. 1 1 Link to post Share on other sites
Joël Mercier 525 Posted January 7 Share Posted January 7 It's just that coffee etch alone will more easily wash off. The ferric will give it better depth. 1 Link to post Share on other sites
Bob Ouellette 73 Posted January 7 Author Share Posted January 7 Thank you all! I'll have to try these out. Link to post Share on other sites
Wesley Davis 0 Posted February 19 Share Posted February 19 Rust bluing. Doesnt require the high temps of hot bluing but takes a lot longer. Link to post Share on other sites
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