Maintaining a handcrafted knife requires neither rare products nor ceremony. Four habits are sufficient in most cases: cleaning it by hand right after use, drying it immediately, monitoring its sharpness before it completely dulls, and storing it clean and dry. The rest depends on the knife itself: a carbon steel blade, a wooden handle, or a folding mechanism each require particular attention, explained below.
A knife is made to serve. It will cut bread, tomatoes, sausage, and it will sometimes leave a mark. That's normal. Maintenance is not intended to preserve a display object: it aims to keep a reliable, pleasant-to-hold tool, which one might pass on one day.
The essentials in five steps
- Wash by hand, in lukewarm water, with a mild detergent. Never in the dishwasher.
- Dry immediately with a clean cloth, including the blade and handle.
- Protect a carbon blade with a light film of oil after wet or acidic use.
- Sharpen regularly, without waiting for the blade to become dull.
- Store the knife clean, dry, protected from knocks — and closed if it is a folding knife.
Clean a handmade knife after use
The right time to clean a knife is immediately. Food residues, especially acidic or salty ones, attack the steel all the more the longer they stay on the blade. A knife that lingers for an hour at the bottom of the sink, in contact with water and leftover food, undergoes more wear than in a week of normal use.
Lukewarm water. A mild dishwashing detergent. A sponge with a soft side or a cloth. That is enough in the vast majority of cases. Scouring powders, abrasive pads, and chlorine-based products scratch the finishes and attack certain steels: they have no place on a knife.
The dishwasher is to be avoided, without exception. Heat, harsh detergents, knocks against other cutlery, and prolonged moisture from the cycle damage the edge, tarnish the steel, and harm the handles, whether made of wood or horn. The same applies to prolonged soaking: a knife should not be left to soak.
The gesture then adapts to the knife. A fixed-blade kitchen knife is washed thoroughly and then dried. A knife with a wooden or horn handle is washed blade down, wetting the handle as little as possible. A folding knife, on the other hand, is not immersed like a spoon: the blade and sides are cleaned without flooding the mechanism — the detail is given below.
Dry and protect the blade
Stagnant moisture is the primary cause of corrosion on all steels. After washing, immediately dry the blade with a clean cloth, not forgetting the heel, the back, and the junction with the handle, where water likes to settle. A knife that dries "in the air" on the dish rack, amid the wet dishes, is not a dry knife.
For a carbon steel blade, or before a period of non-use, a very light film of oil completes the protection. Two options will do: camellia oil, long used in cutlery, or a food-grade paraffin oil (called codex), odorless and stable over time. A drop spread with a cloth is sufficient. Common cooking oils — olive, sunflower, rapeseed — should be avoided: they go rancid and eventually make the blade sticky.
Adapt maintenance to the type of steel
All cutlery steels are cleaned the same way. It is their behavior towards moisture and acids that differs, and therefore the level of caution to adopt.
Stainless steel: resistant, not invulnerable
"Stainless" means that the steel resists corrosion much better, not that it is immune to it. Salt, food acids — lemon, vinegar, tomato — persistent moisture, or forgotten residues on the blade can cause corrosion spots, even on stainless steel. The practices remain the same: quick cleaning, immediate drying, storage in a dry place. Simply put, occasional neglect is more easily forgiven.
Carbon steel: distinguish the patina from rust
A carbon steel blade changes in appearance with use, and this is expected. In contact with food, it develops a patina: a stable surface oxidation, in shades of gray to bluish, which partially protects the steel and tells the life story of the knife. A cheese board and some fruit are enough to initiate it. This patina is not a flaw and does not come off with each wash.
Rust, on the other hand, is recognized by its orange color and its powdery or crusty appearance. It is an active corrosion that eats away at steel and must be treated as soon as it appears. A carbon blade therefore requires more vigilance after cutting acidic foods, using it in wet conditions, prolonged transport, or storage in a sheath. For detailed steps — removing emerging rust, intentional patina, oiling — consult the guide for protect a carbon steel blade.
Caring for the handle
A wooden handle is a material that is alive. It does not like soaking or sudden changes in humidity and temperature: the edge of a sink filled with hot water, the sill of a window in full sun, or a car in summer are not its friends. On a daily basis, wiping it with a damp cloth followed by immediate drying is enough.
From time to time, if the wood appears dry or dull, a maintenance product can be applied sparingly: food-grade paraffin oil or pure beeswax, in very small amounts, wiped off after a few minutes. Again, no cooking oil: it goes rancid. Stabilized woods — whose fibers have been impregnated with resin — require less care, but still need both drying and common sense. The complete subject, including materials, is covered in the guide for maintaining a wooden knife handle.
Horn follows logic similar to wood: no soaking, no heat, careful drying. Composite handles, like Micarta, are more tolerant — without, however, justifying the dishwasher.
Maintaining a folding knife
A folding knife adds a constraint: its mechanism. Pivot, spring, liner lock or friction, all of this works better clean and dry. The first principle is simple: avoid unnecessarily letting water enter the mechanism. The blade and the sides are cleaned with a damp cloth rather than by running the knife under the tap.
Accessible dust and debris — crumbs from snacks, pocket lint — can be removed with a soft brush, a toothpick, or a puff of air. A drop of food-safe oil, applied to the pivot and then wiped off, maintains the joint; there is no need to apply more, as the excess attracts dust. Disassembly is neither necessary nor recommended as part of regular maintenance.
If play appears, if the spring behaves abnormally, or if the opening becomes stiff for no reason, it is a sign that an inspection is needed — not that you should tighten things at random. Detailed steps are provided in the guide for maintaining a folding knife.
Maintaining the edge and knowing when to sharpen
Two distinct operations maintain the sharpness. Honing straightens the edge between two sharpenings: a pass on a smooth steel or fine ceramic, a few seconds, and the blade regains its bite. Sharpening, on the other hand, removes a bit of material to reform the edge: it is used when honing is no longer enough.
The right reflex is to intervene early. A blade that starts to require more effort — the tomato that gets squashed instead of being sliced — can be fixed in a few minutes. A completely dull blade requires a much longer job, with more material removed.
With a handcrafted knife, two precautions are worthwhile. First, respect the existing geometry: a poorly controlled angle, repeated sharpening after sharpening, will eventually change the behavior of the blade. There is no universal angle suitable for all knives. Next, avoid carbide-tipped sharpeners, which remove material more than they sharpen. A water stone, ceramic, or guided system is appropriate, depending on the blade and your comfort. The techniques, the choice of grains, and the movements are detailed in the guide for sharpening and honing a knife.
A chipped blade, a broken tip, or a very deformed edge go beyond regular maintenance: this is the field of professional repair. In the workshop, I fix this type of damage on a grinder and stones, while preserving the original geometry as much as the material allows.
Store and transport the knife
The rule comes down to three words: clean, dry, protected. A knife stored with residue or moisture continues to deteriorate in its drawer. A knife that bumps against other blades chips. Block, magnetic strip, blade guard, or compartmentalized drawer: the solution doesn't matter, as long as it is clean and prevents metal-to-metal contact.
One point deserves to be clarified: the leather sheath is meant for transport, not always for long-term storage. Leather retains moisture, and some tanned leathers can, over time, leave marks on a blade — especially carbon steel. After use, the knife should be taken out of the sheath, dried, and stored separately. A folding knife, on the other hand, is stored closed, with the mechanism at rest. Details — protections, transport conditions, long periods of non-use — can be found in the guide for storing and transporting a knife.
Maintenance at a glance
| Element | After use | Periodic inspection | Error to avoid |
|---|---|---|---|
| Stainless steel blade | Hand wash, immediate drying | Check for the absence of nicks, especially after salt or acids | Believe stainless steel is insensitive and store the blade wet |
| Carbon blade | Hand wash, drying, light film of oil after wet or acidic use | Watch for any orange spots; leave the patina alone | Confuse patina with rust, or sand off the patina at each wash |
| Wooden handle | Damp cloth, immediate drying | Food-grade paraffin oil or beeswax if the wood looks dry | Soaking, dishwasher, kitchen oil that goes rancid |
| Folding knife | Cleaning with a cloth without immersing the mechanism | Soft brush and drop of oil on the pivot according to frequency of use | Immersion, excess lubricant, disassembly without necessity |
| Sharpness | Quick check during use | Sharpening as soon as cutting requires more effort; honing when sharpening is no longer sufficient | Wait for complete dulling or use a carbide blade sharpener |
| Sheath or protection | Remove the knife from the leather sheath after transport | Check the cleanliness and dryness of the storage before prolonged storage | Storing a blade for a long time in a damp leather sheath |
Mistakes to avoid
- The dishwasher, for any handcrafted knife, regardless of its material.
- Soaking in the sink, even 'just for the duration of the meal'.
- Storing a knife still wet, or forgetting it wet in its sheath.
- Oil the blade or handle with a cooking oil that will go rancid.
- Run the blade through a carbide rod sharpener.
- Wait until a blade is completely dull to take care of it.
- Tighten, twist, or hit a folding mechanism that has a defect.
- Storing a knife in a dirty drawer, or loosely against other blades.
When to contact customer service
Routine maintenance has its limits, and that is perfectly fine. Some situations justify a workshop check rather than a home intervention:
- a mechanical play appearing on a folding knife;
- a spring or a detent behaving unusually;
- a broken tip or chipped blade;
- a very damaged or deformed edge;
- deep corrosion, beyond a few superficial spots;
- a cracked, warped handle or a loose component;
- a doubt before any disassembly;
- the need for a complete overhaul after years of use.
A play that appears, a broken tip, or a severely damaged thread cannot be adjusted on the corner of a table, and even less with pliers. In case of doubt, it is better to contact me before disassembling anything: consult FL Toussaint after-sales service allows the knife to be examined before worsening the problem.
A tool that lasts a long time
A well-maintained knife is not an intact knife: it is a knife that cuts, that has been used, and that is ready to be used again. Quick cleaning, systematic drying, regular sharpening, storing in a dry place — these habits take less time than reading this page, and they make the difference between a tool that lasts for decades and a drawer full of regrets.
Every piece that comes out of the workshop is designed for long-term use, and to be worked on again if it ever needs it. To see what this looks like in practice, you can discover FL Toussaint handmade knives.