![]() The mustard brings the acid and stays where you put it, but a thick layer can block the oxygen so if I want to etch a stripe or patch I try to thin it out and apply only a light coating. The steel darkens when exposed to acid and oxygen. "For the mustard patina I just go the cheapest yellow mustard and maybe thin it out with lemon juice or vinegar depending. This is what Daniel had to say on the etching process: We love it and wanted to share a couple of photos here. The clever use of a bright, eye-grabbing handle material against the somewhat subdued blade really makes the knife pop out from the photos. By applying a pattern of mustard and re-etching he has created different shades of etch with only one etchant. Mustard etching is not a new process, but Daniel has used it in a very clever way to create a two-tone effect in a herringbone pattern. To create a more uniform blade finish, some choose to etch the entire blade and then either leave it as-is or polish the etch partially off again. The acidic food materials being cut by the blade will etch the surface steel and create coloured blotches or shades. ![]() Brass dovetail bolsters front and rear finishes the knife off.Ĭarbon steel when used in the kitchen will patina and discolour over time with use. The blade is in 1084 high carbon steel that has been mustard etched. As such you can form different patterns on the blade.Daniel Dashevsky posted his latest chef knife on the Australian Beginner Knifemaking Group on Facebook over the weekend and it is a stunner! Within fifteen minutes you will start seeing results. This is so acidic the patina will form in no time. Some people choose to rub some mustard over the blade. ![]() Not in the mood to take extra good care of your knife in the first weeks to prevent rust? You could, of course, always help out a bit. How do you force a patina to emerge on a blade? The second is used to actually dry off the blade. Putting your knife aside in this condition is simply asking for rust to appear.įor that reason Japanese chefs use two cloths: one that is allowed to get wet to remove most of the water and clean the steel. You will notice that in many cases the surface of the knife remains slightly moist. It is for that reason also very important to properly dry the knife after cleaning it.Įspecially with kitchen knives it occurs often that a Japanese carbon steel knife is dried off with a cloth that is already moist to begin with. You still have to use and clean it as you are used to. The fact that you would love to enhance your carbon steel knife with a patina doesn’t mean it is okay to neglect it. How can you form a patina on your knife in a controlled manner? The line between both might be thin, but patina is more controlled than rust. Rust, however, continues to spread and will affect the knife in the end. After all, patina is a thin layer that forms on the blade and is ‘finished’ after some time. When you learn that patina forms on knives that are not very corrosion resistant you might start to think that it is simply rust. What is the difference between patina and rust? Well-known catalysts of patina are: salt, acids and moisture. You could, for instance, expose two exactly similar knives to different circumstances and you will notice different discolourations on both. How does patina emerge?īecause of external influences patina can emerge in different ways. For instance, a (kato://product/Buck 110) can have a flawless blade while the brass bolsters show the actual age and character of the knife. Those metals can turn black or even green. However, patina can also manifest itself on other materials. Some steels cannot withstand corrosion at all and start to form a patina the moment you hold your finger against it, other types require long-term explosion to the elements to start showing discolouration after a couple of weeks or months. That is due to the different degrees of corrosion resistance. Sometimes there are major differences between the types of carbon steel or tool steel that are used. Our Eden Kanso Aogami-knives are known for the stunning patina they form. Think of survival knives made from, for instance, 1095 carbon steel. In general patina forms on carbon steel knives.
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