Darken a D2 Knife

I am very new to the knife collecting world. I currently have a D2 knife that I carry daily but I wanted to know what would be the best way to darken the color of the blade and potentially provide more corrosion resistance as well. I'm considering acid-etching but have also heard you could soak a knife in vinegar as well.

What would be the best option here? Any help is appreciated.