PATINA

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Patina is an integral part of a carbon steel knife's identity.

A patina is a thin layer that forms on the surface of oxidized steel and protects it from further oxidation. A patina formed on steel does help to prevent rust from forming on a steel blade. 

A patina is a type of aging that happens naturally to carbon steel and stainless steel to some extent. It is less likely to form on stainless steel due to the presence of chromium.

 A natural patina will form over time as the blade is introduced to salt, acid, water, and wear. 

 The patina should not be confused with rust as the former protects the blade, while the latter causes corrosion and deterioration of material.

Rust is a thicker layer of usually brown iron oxide with a reddish tinge formed by the reaction of iron and oxygen in the presence of water or air moisture. Rust does not protect the blade but rather speeds up further corrosion on the spot where it developed. If you notice rust on the blade, you should remove it before using the knife.

• Wipe it regularly with a clean and dry cloth (you can also do this during use).
• After use, make sure you rinse it with lukewarm water and wipe it dry.
• Gently coat it in mineral oil.
• You can store the knife by wrapping it in paper which will absorb moisture and protect the blade.