When I read a knife has been "Hot blued" I like the way this looks

[PredatorEdge]

Here is a good tutorial on Hot Salt Bluing for those of you wanting to try it out.
If done right it turns out a quality finish.
I agree with Chris that either Hot Salt Bluing or Rust Bluing is far more durable then Nitre Bluing.

http://www.blindhogg.com/homemadesalts.html

 

[Bill Vining]

Here is one I had Hot Blued a while back.