Cutting on hard surfaces—such as glass, granite, ceramic plates, or marble—dulls a knife the fastest. These materials are harder than the steel itself, causing the microscopic edge of the blade to bend, chip, or fold over immediately upon contact.
Never cut on glass, ceramic or countertops. Those surfaces are harder than a knife's edge and will quickly dull the blade. It's what you cut on that dulls knives, not what you're cutting.
A well-sharpened kitchen knife can stay sharp for weeks or even months under light home use, but in a high-volume professional kitchen that same edge might dull within days.
Common Mistakes That Dull Your Knives
Cardboard dulls knives quickly primarily because it is highly abrasive and often contains silicates (sand/dust) from the recycling process.
No, aluminum foil cannot truly sharpen a knife. Aluminum is much softer than steel, so it lacks the abrasive material needed to shave off metal and reshape the edge.
In the high-end folding knife community, the original "Holy Trinity" refers to three legendary American makers who pioneered the modern premium tactical folder. Together, their designs set the gold standard for durability and precision.
Yes, leaving knives in water absolutely dulls them. Water causes microscopic metal erosion and rust, which degrades the fine edge of the blade over time. It can also seep into the handle, causing the wood to rot or warp.
In the sharpening phase, we do not recommend any current WD-40® Brand Products although some may be used later for storage & protection. For sharpening stones the lubrication can come from water or oil.
Rule #1: It is important to use a knife adapted to what you want to do / food you want to prepare. For example, you shouldn't use a bread knife to slice a roast or use the blade of a paring knife and use it as a screwdriver (don't laugh, we've all done it!) Rule #2: Don't drop your knife on the floor.
While the cheap knife will sharpen, it's important to note that it will lose that sharp edge faster than a more quality knife would because it's made of weaker steel. Because of this, cheap knives need to be sharpened more frequently, depending on how often you use them.
For most kitchens, you only need three foundational knives to handle 95% of prep work: a Chef's Knife, a Paring Knife, and a Serrated (Bread) Knife. These three powerhouses can tackle anything from dicing onions and slicing crusty bread to peeling fruits and carving small meats.
3-Finger Test
Lightly place the knife edge on your fingers (sideways, not pointing down) and gently pull. A sharp blade will feel very "grabby" and not slip easily over your skin.
Navy SEALs commonly use the Cold Steel SRK (Survival Rescue Knife) for training and the Ontario Mk3 Mod 0 for diving operations. While these are standard-issue, SEALs often choose personalized knives based on preference, such as those from Benchmade, SOG, or custom makers.
Neither steel is objectively "better" overall; they simply excel at different things. The choice depends on your priorities: German steel is better for heavy-duty durability and low maintenance, while Japanese steel is better for razor-sharp precision and edge retention.
Difference between 420 and 440 stainless steel
If corrosion resistance is a priority but hardness isn't as important, 440A might be a better choice than 420. However, if maximum hardness and wear resistance are needed, 440C is the superior option, despite its higher cost and more challenging machinability.
Butterfly knives (or balisongs) are illegal in many areas because they are categorized as dangerous, easily concealed weapons that can be deployed rapidly with one hand. Lawmakers often associate their flashy nature with gang activity, intimidation tactics, and pop-culture violence.
Here are a few common tools:
Gordon Ramsay primarily uses a traditional honing steel (or sharpening rod) to maintain knife edges before use, emphasizing safety and consistent 45° angles. While he often uses professional whetstones for deep sharpening, modern demonstrations (and fan-used products) have shown the Tumbler Rolling Sharpener to be highly effective for achieving a razor-sharp edge on his knives.
There is a way to case-harden steel that is inexpensive and quick and can be done with an acetylene torch as the heat source. It uses a powder called Cherry Red that is available from tool supply houses. Use this method when you need a local repair or prototype touch-up.
For whetstone sharpening, you should generally sharpen your knives wet. Using water or honing oil provides crucial lubrication that carries away metal shavings, prevents the stone from clogging, and acts as a coolant to protect the steel's temper from heat.
John Wick famously wields a signature series of high-end, out-the-front (OTF) automatic knives in his movies. The specific knives vary depending on the film, transitioning from production models by Microtech Knives in the first three movies to a highly exclusive custom blade in the fourth.
In many cultures, giving someone a knife or another sharp object is thought to symbolically cut or sever the bond between giver and receiver. The knife's sharp edge represents division, which can be interpreted as bringing misfortune to a friendship, romantic relationship, or family tie.
Yet despite all the talk about knives that goes on in both home and professional kitchens — and despite all the knives out there that are truly great to have — there are just three knives every kitchen ultimately needs: a chef's knife, a paring knife, and a bread knife.