The look of this blade

[G3E]

https://imgur.com/a/bfsDb3z

can anyone explain to me how to achieve this effect on the blade?

 

[eric brinkerhoff]

That is San Mai steel made of three layers of steel forge welded together. It's got a carbon steel center and stainless steel sides. Makers use various methods to darken the carbon steel to show the contrast

 

[FredyCro]

Twas quenched in the blood of the werewolf in the night of the dark moon.