My friend brought me back a couple yoshisada knives from Japan and couldn’t be happier with how sharp and nice they feel.

Used it for the first time today and washed it with one of those blue (non abrasive) soap dispensing sponges and dried it with a paper towel. The blade was left with this dark discoloration/tarnish that is very unsightly.

Any ideas on what this is, what caused it, and/or how to restore?

The only thing that I think could have caused it is that I cut a sandwich that had red wine vinegar on it and it sat for about 20 minutes before I cleaned

by durpabiscuit

2 Comments

  1. aWittyTwit-2712

    Looks like patina caused by whatever you were cutting… fish, beef & other foods will cause a reaction (oxidation) with the high carbon content…

    It’s character, & protects from rust (while sort of being rust’s pretty cousin), so continue to add that history to the canvas 🔪🇨🇦🤙

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