Thats crazy is that yanagiba on the left meant to be a full size one that he has just used to that extent?
It's from scrubbing the handles daily with powdered cleansers like Ajax or something similar.
Starting this harvest I'm a starving startling artist/
Lyrical arsonist it's arduous spitting this smartest arsenic/
When I was cutting plenty fish.Ahi would get in the handle & would have to scrub it.About 6 yrs ago I got a Stepan Keller culy Koa Buff. horn.It worked great easy to clean.Held up well still have that Aritsugu 270mm blue steel yanagiba.