unless im mistaken any strong base such as ammonia or bleach will work,,,BUT research it before hand...you never know what kinda chemical reaction youll get unless you do your homework.BE SAFE!
it wil fizz and bubble and have a strong reaction to the steel.pull it out/let it dry take 000 steel woll and buff the surface rust off repeat until you get the coverage you want....then boil enough water to immerse the blade into.let it boil for 20 minutes or so...add some tea bags(black) if you want the tannic acid in them will help to blacken the blade...and poof...aged steel.let it dry oil it up and there ya go.
Well for my personal belt knife i blackened the blade.......take hydrogen peroxide and put in a pyrex glass(think measuring cup in the kitchen)heat in the microwave until boiling CAREFULLY remove it and mix salt until satureted then brush onto the blade or soak it if your container is large enough...to be continued.
Thanks jas.l..i wear them everywhere...... especially at work.they stop glass just fine amd keep me safe.they are just 3 strands of the appropriate metal twisted and hammerd flat.