A knife is a tool or weapon with a cutting edge or blade, usually attached to a handle or hilt. One of the earliest tools used by humanity, knives appeared at least 2.5 million years ago, as evidenced by the Oldowan tools. Originally made of wood, bone, and stone, over the centuries, in step with improvements in both metallurgy and manufacturing, knife blades have been made from copper, bronze, iron, steel, ceramic, and titanium. Most modern knives have either fixed or folding blades; blade patterns and styles vary by maker and country of origin.
A blade is the sharp, cutting portion of a tool, weapon, or machine, specifically designed to puncture, chop, slice, or scrape surfaces or materials. Blades are typically made from materials that are harder than those they are intended to cut. This includes early examples made from flaked stones like flint or obsidian, evolving through the ages into metal forms like copper, bronze, and iron, and culminating in modern versions made from steel or ceramics. Serving as one of humanity's oldest tools, blades continue to have wide-ranging applications, including in combat, cooking, and various other everyday and specialized tasks.
Deba bōchō — "fish-preparer" — are a style of Japanese kitchen knives primarily used to cut fish, though are also used occasionally in cutting meat. Debas have wide blades and are the thickest of all Japanese kitchen knives and come in different sizes — sometimes up to 30 centimetres in length and 10 millimetres thick — but usually considerably shorter, normally between 12 and 20 cm long with a blade between 5 and 7 mm thick. The larger form of knife is called an hon-deba, whereas the smaller form is a ko-deba.
A Japanese kitchen knife is a type of kitchen knife used for food preparation. These knives come in many different varieties and are often made using traditional Japanese blacksmithing techniques. They can be made from stainless steel, or hagane, which is the same kind of steel used to make Japanese swords. Most knives are referred to as hōchō or the variation -bōchō in compound words but can have other names including -kiri. There are four general categories used to distinguish the Japanese knife designs: handle, blade grind, steel, and construction.
Nakiri bōchō and usuba bōchō are Japanese-style vegetable knives. They differ from the deba bōchō in their shape, as they have a straight blade edge, with no or virtually no curve, suitable for cutting all the way to the cutting board without the need for a horizontal pull or push. These knives are also much thinner. While the deba is a thick blade for easy cutting through thin bones, the blade is not suitable for chopping vegetables, as the thicker blade can break the vegetable slice. The nakiri and the usuba have much thinner blades. This does not help with cutting small bones in fish or meat, but is useful for cutting vegetables.
Yanagi-ba-bōchō, Yanagiba, or yanagi, is a long and thin knife used in the Japanese cuisine. It is the typical example of the sashimibōchō used to slice fish for sashimi and nigirizushi.
Usuba bōchō is the traditional vegetable knife for the professional Japanese chef. Like other Japanese professional knives, usuba are chisel ground, and have a single bevel on the front side, and have a hollow ground urasuki on the back side. Usuba characteristically have a straight edge, with little or no curve, and are wide or tall blade in height, to allow knuckle clearance when chopping on a cutting board. A usubas is relatively thin compared to other knives, required for cutting through firm vegetables without cracking them. Due to its height and straight edge, they are also used for specialized cuts such as katsuramuki, shaving a vegetable cylinder into a thin sheet.
Sashimi bōchō, 刺身 — literally "sashimi knife" — is a type of long, thin kitchen knife used in Japanese cuisine to prepare sashimi . Similar to the nakiri bōchō, the style differs slightly between Tokyo and Osaka. Types of sashimi bōchō include:
A kitchen knife is any knife that is intended to be used in food preparation. While much of this work can be accomplished with a few general-purpose knives — notably a large chef's knife and a smaller serrated blade utility knife — there are also many specialized knives that are designed for specific tasks such as a tough cleaver, a small paring knife, and a bread knife. Kitchen knives can be made from several different materials, though the commonest is a hardened steel blade with a wooden handle.
The santoku bōchō(Japanese: 三徳包丁, — lit. "three virtues knife" or "three uses knife") or bunka bōchō(文化包丁) is a general-purpose kitchen knife originating in Japan. Its blade is typically between 13 and 20 centimetres long, and has a flat edge. The santoku has a sheep's foot-tipped blade that curves down an angle approaching 60 degrees at the point. The bunka bōchō, however, has a k-tip. The term santoku may refer to the wide variety of ingredients that the knife can handle: fish, meat, and vegetables, or to the tasks it can perform: chopping, dicing, and slicing, with either interpretation indicating a multi-use, general-purpose kitchen knife. The term bunka, refers to how it is used for the cultural food of Japan. The blade and handle of the santoku are designed to work in harmony by matching the blade's width and weight to the weight of the tang and the handle.
WÜSTHOF is a knife-maker based in Solingen, Germany. Family owned for seven generations, the company's main products are mid-priced to high-end kitchen knives for domestic and professional use. WÜSTHOF is one of the leading manufacturers of chef's knives.
Spyderco is an American cutlery company based in Golden, Colorado, producing knives and knife sharpeners. Spyderco pioneered many features that are now common in folding knives, including the pocket clip, serrations, and the opening hole. Spyderco has collaborated with 30 custom knife makers, athletes, and self-defense instructors for designs and innovated the usage of 20 different blade materials.
Sharpening is the process of creating or refining the edge joining two non-coplanar faces into a converging apex, thereby creating an edge of appropriate shape on a tool or implement designed for cutting. Sharpening is done by removing material on an implement with an abrasive substance harder than the material of the implement, followed sometimes by processes to polish/hone the sharp surface to increase smoothness.
Knife making is the process of manufacturing a knife by any one or a combination of processes: stock removal, forging to shape, welded lamination or investment cast. Typical metals used come from the carbon steel, tool, or stainless steel families. Primitive knives have been made from bronze, copper, brass, iron, obsidian, and flint.
A cleaver is a large knife that varies in its shape but usually resembles a rectangular-bladed hatchet. It is largely used as a kitchen or butcher knife and is mostly intended for splitting up large pieces of soft bones and slashing through thick pieces of meat. The knife's broad side can also be used for crushing in food preparation and can also be used to scoop up chopped items.
Knife sharpening is the process of making a knife or similar tool sharp by grinding against a hard, rough surface, typically a stone, or a flexible surface with hard particles, such as sandpaper. Additionally, a leather razor strop, or strop, is often used to straighten and polish an edge.
A honing steel, sometimes referred to as a sharpening steel, whet steel, sharpening stick, sharpening rod, butcher's steel, and chef's steel, is a rod of steel, ceramic or diamond-coated steel used to restore keenness to dulled blade edges. They are flat, oval, or round in cross-section and up to 30 centimetres (1 ft) long. The steel and ceramic honing steels may have longitudinal ridges, whereas the diamond-coated steels are smooth but embedded with abrasive diamond particles.
Honyaki (本焼) is the name for the Japanese traditional method of metalwork construction most often seen in kitchen knives by forging a blade, with a technique most similar to the tradition of nihonto, from a single piece of high-carbon steel covered with clay to yield upon quench a soft, resilient spine, a hamon, and a hard, sharp edge. Honyaki as a term alone can refer to either mizu honyaki (water-quench) or abura honyaki. The goal is to produce a sharper, longer lasting edge than is usually achievable with the lamination method. The term has been adapted to describe high-end mono-stainless in Japan and carbon blades by non-Japanese bladesmiths that have a hamon but are made with Western steel, heat treat, equipment, finishing, and design.
A Chinese chef's knife — sometimes referred to as a Càidāo, a Chinese knife, the rectangular-bladed, all-purpose chef’s knife used to prepare a variety of meats, fish and vegetables. The popularity of this style of knife has spread with the associated cuisines. They resemble Western cleavers in appearance, but most Chinese chef's knives are relatively thin-bladed and designed for slicing, finely chopping and mincing vegetables, fish and boneless meats. The heavier gǔdāo are produced and are used much like Western-type meat cleavers to prepare large sides of beef, pork and other boned meats. However, Chinese-style knives of this weight are not common in the West.
