NEVER PUT YOUR KNIFE IN THE DISHWASHER!
Though shiny when new, the knife will gradually darken with a graphite coloured sheen, remember they are High Carbon Steel. When cutting certain vegetables and fruits (onions, lemon…) you might notice a greyish colouration occurring. This is perfectly normal, it’s a natural oxidisation which is not harmful in any way. In time, the blade will develop its unique patina.
It is essential to wash and thoroughly towel dry the knife as soon as done using it. Leaving it for later or in the sink will allow moisture to begin corroding the blade. Drying will also protect the handle, even if it has been treated and oiled, soaking is of no benefit.
Giving the blade a more aggressive, thorough scrub with a scourer and the handle with a sponge using warm soapy water is recommend. Thoroughly drying with a clean cotton towel and applying a little dab of any food grade oil (I use traditional
Japanese Camellia Oil) or even cooking oil (only if the knife is in constant use as cooking oils will denaturalise and allow rusting with time), with a clean cotton cloth is essential to keep a healthy blade. Tung or teak oil
can also be applied to the handles by using a different cloth. Contrary to certain sources, never use lard or other animal fat! This will only seriously corrode the blade and negatively affect the handle.
If you are to leave the knife out of service for a period of time, make sure to leave it well oiled (mineral oils or gun oil can now be left on the blade). Its good practice to wrap blade and handle with their respective cloths used for oiling. It's convenient to give the knife a good wash before using again.
Ceremony and rituals are ways of making sure that a process is properly executed without omitting any step. This is a good chance to start your very own ceremony or ritual!