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Tanning (leather)
Tanning is the process of treating skins and hides of animals to produce leather. A tannery is the place where the skins are processed. Tanning hide into leather involves a process which permanently alters the protein structure of skin, making it more durable and less susceptible to decomposition and coloring. Before tanning, the skins are dehaired, degreased, desalted and soaked in water over a period of six hours to two days. Historically this process was considered a noxious or "odoriferous trade" and relegated to the outskirts of town. Historically, tanning used tannin, an acidic chemical compound from which the tanning process draws its name, derived from the bark of certain trees. An alternative method, developed in the 1800s, is chrome tanning, where chromium salts are used instead of natural tannins. History The English word for tanning is from medieval Latin , derivative of ( oak bark), from French (tanbark), from old-Cornish (red oak). These terms are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tanned Leather
{{disambiguation ...
Tanning may refer to: *Tanning (leather), treating animal skins to produce leather *Sun tanning, using the sun to darken pale skin **Indoor tanning, the use of artificial light in place of the sun **Sunless tanning, application of a stain or dye to the skin (active ingredient in tanning lotion products is dihydroxyacetone (DHA)). * Physical punishment, metaphorically, such as a severe spanking which leaves clear marks See also *Skin whitening *Tan (color) *Tan (other) *Tannin (other) Tannin usually refers to astringent, bitter chemical compounds naturally occurring in plants, which are used in tanning hides and prominent in the taste of some red wines. It may also refer to: * Tannin, a monster in Levantine mythology See al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quiver
A quiver is a container for holding arrows, bolts, ammo, projectiles, darts, or javelins. It can be carried on an archer's body, the bow, or the ground, depending on the type of shooting and the archer's personal preference. Quivers were traditionally made of leather, wood, furs, and other natural materials, but are now often made of metal or plastic. Etymology The English word quiver has its origins in Old French, written as quivre, cuevre or coivre. Types Belt quiver The most common style of quiver is a flat or cylindrical container suspended from the belt. They are found across many cultures from North America to China. Many variations of this type exist, such as being canted forwards or backwards, and being carried on the dominant hand side, off-hand side, or the small of the back. Some variants enclose almost the entire arrow, while minimalist "pocket quivers" consist of little more than a small stiff pouch that only covers the first few inches. The Bayeux Tapestry ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alkaline
In chemistry, an alkali (; from ar, القلوي, al-qaly, lit=ashes of the saltwort) is a basic, ionic salt of an alkali metal or an alkaline earth metal. An alkali can also be defined as a base that dissolves in water. A solution of a soluble base has a pH greater than 7.0. The adjective alkaline, and less often, alkalescent, is commonly used in English as a synonym for basic, especially for bases soluble in water. This broad use of the term is likely to have come about because alkalis were the first bases known to obey the Arrhenius definition of a base, and they are still among the most common bases. Etymology The word "alkali" is derived from Arabic ''al qalīy'' (or ''alkali''), meaning ''the calcined ashes'' (see calcination), referring to the original source of alkaline substances. A water-extract of burned plant ashes, called potash and composed mostly of potassium carbonate, was mildly basic. After heating this substance with calcium hydroxide (''slaked lim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urine
Urine is a liquid by-product of metabolism in humans and in many other animals. Urine flows from the kidneys through the ureters to the urinary bladder. Urination results in urine being excreted from the body through the urethra. Cellular metabolism generates many by-products that are rich in nitrogen and must be cleared from the bloodstream, such as urea, uric acid, and creatinine. These by-products are expelled from the body during urination, which is the primary method for excreting water-soluble chemicals from the body. A urinalysis can detect nitrogenous wastes of the mammalian body. Urine plays an important role in the earth's nitrogen cycle. In balanced ecosystems, urine fertilizes the soil and thus helps plants to grow. Therefore, urine can be used as a fertilizer. Some animals use it to mark their territories. Historically, aged or fermented urine (known as lant) was also used for gunpowder production, household cleaning, tanning of leather and dyeing of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flesh
Flesh is any aggregation of soft tissues of an organism. Various multicellular organisms have soft tissues that may be called "flesh". In mammals, including humans, ''flesh'' encompasses muscles, fats and other loose connective tissues, but sometimes excluding non-muscular organs (liver, lung, spleen, kidney) and typically discarded parts (hard tendon, brain tissue, intestines, etc.). In a culinary context, consumable animal flesh is called meat, while processed visceral tissues are known as offal. In particular animal groups such as vertebrates, molluscs and arthropods, the flesh is distinguished from tougher body structures such as bone, shell and scute, respectively. In plants, the "flesh" is the juicy, edible structures such as the mesocarp of fruits and melons as well as soft tubers, rhizomes and taproots, as opposed to tougher structures like nuts and stems. In fungi, ''flesh'' refers to trama, the soft, inner portion of a mushroom, or fruit body. A more restrict ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wheel
A wheel is a circular component that is intended to rotate on an axle bearing. The wheel is one of the key components of the wheel and axle which is one of the six simple machines. Wheels, in conjunction with axles, allow heavy objects to be moved easily facilitating movement or transportation while supporting a load, or performing labor in machines. Wheels are also used for other purposes, such as a ship's wheel, steering wheel, potter's wheel, and flywheel. Common examples are found in transport applications. A wheel reduces friction by facilitating motion by rolling together with the use of axles. In order for wheels to rotate, a moment needs to be applied to the wheel about its axis, either by way of gravity or by the application of another external force or torque. Using the wheel, Sumerians invented a device that spins clay as a potter shapes it into the desired object. Terminology The English word '' wheel'' comes from the Old English word , from Proto-Germanic , f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chariot
A chariot is a type of cart driven by a charioteer, usually using horses to provide rapid motive power. The oldest known chariots have been found in burials of the Sintashta culture in modern-day Chelyabinsk Oblast, Russia, dated to c. 2000 BCE. The critical invention that allowed the construction of light, horse-drawn chariots was the spoked wheel. The chariot was a fast, light, open, two- wheeled conveyance drawn by two or more horses that were hitched side by side, and was little more than a floor with a waist-high guard at the front and sides. It was initially used for ancient warfare during the Bronze and Iron Ages, but after its military capabilities had been superseded by light and heavy cavalries, chariots continued to be used for travel and transport, in processions, for games, and in races. Etymology The word "chariot" comes from the Latin term ''carrus'', a loanword from Gaulish. In ancient Rome and some other ancient Mediterranean civilizations, a '' b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stud
Stud may refer to the following terms: Animals * Stud (animal), an animal retained for breeding ** Stud farm, a property where livestock are bred Arts and entertainment * Stud (band), a British progressive rock group * The Stud (bar), a gay bar in San Francisco * ''The Stud'' (film), a 1978 film starring Joan Collins and Oliver Tobias * ''The Stud'' (novel), by Jackie Collins * ''Studs'' (game show), a dating show from the early 1990s * Stud poker, a card game with numerous variations, including: ** Five-card stud ** Seven-card stud ** Caribbean stud poker * ''Studs'' (film), a 2006 Irish film by Paul Mercier * Studs McGirdle, a character in ''Cars'' (film) Other uses * Cleat (shoe), a protrusion on the sole of a shoe worn for playing sports * Shirt stud, a decorative fastener * Threaded rod, a kind of bolt * Wall stud A wall stud is a vertical repetitive framing member in a building's wall of smaller cross section than a post. It is a fundamental element in frame ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Copper
Copper is a chemical element with the symbol Cu (from la, cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orange color. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins, and constantan used in strain gauges and thermocouples for temperature measurement. Copper is one of the few metals that can occur in nature in a directly usable metallic form ( native metals). This led to very early human use in several regions, from circa 8000 BC. Thousands of years later, it was the first metal to be smelted from sulfide ores, circa 5000 BC; the first metal to be cast into a shape in a mold, c. 4000 BC; and the first metal to be purposely alloyed with another metal, tin, to create ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sumer
Sumer () is the earliest known civilization in the historical region of southern Mesopotamia (south-central Iraq), emerging during the Chalcolithic and early Bronze Ages between the sixth and fifth millennium BC. It is one of the cradles of civilization in the world, along with ancient Egypt, Elam, the Caral-Supe civilization, Mesoamerica, the Indus Valley civilisation, and ancient China. Living along the valleys of the Tigris and Euphrates rivers, Sumerian farmers grew an abundance of grain and other crops, the surplus from which enabled them to form urban settlements. Proto-writing dates back before 3000 BC. The earliest texts come from the cities of Uruk and Jemdet Nasr, and date to between c. 3500 and c. 3000 BC. Name The term "Sumer" ( Sumerian: or , Akkadian: ) is the name given to the language spoken by the "Sumerians", the ancient non- Semitic-speaking inhabitants of southern Mesopotamia, by their successors the East Semitic-speaking Akkadians. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2500 BCE
The 25th century BC was a century that lasted from the year 2500 BC to 2401 BC. Events * c. 2900–2334 BC: Mesopotamian wars of the Early Dynastic period. * c. 2560 BC: Construction of the Great Pyramid of Giza is completed. * c. 2500 BC: Rice was first introduced to Malaysia * c. 2500 BC: Scribal schools flourish throughout Sumer. * c. 2500 BC: Assyria is established. * c. 2500 BC: Cylinder seal from Sumer and its impression are made. It is now in the Metropolitan Museum of Art, New York. * c. 2500 BC: Excavation and development of the Hypogeum of Ħal-Saflieni at Paola, Malta, a subterranean temple complex subsequently used as a necropolis. * c. 2500 BC: The Pyramid of Khafre, Giza, is built. * c. 2500 BC: The sculpture Khafre Enthroned is made. * c. 2500 BC: People in Peru rely on fish and mussels for food. *c. 2500 BC: Evidence of long-distance trade routes in South America. * c. 2500 BC: Skara Brae is abandoned after approximately 600 years of occupation. * c. 2500–2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mehrgarh
Mehrgarh (; ur, ) is a Neolithic archaeological site (dated ) situated on the Kacchi Plain of Balochistan in Pakistan. It is located near the Bolan Pass, to the west of the Indus River and between the modern-day Pakistani cities of Quetta, Kalat and Sibi. The site was discovered in 1974 by an archaeological team led by the French archaeologists Jean-François Jarrige and his wife, Catherine Jarrige. Mehrgarh was excavated continuously between 1974 and 1986, and again from 1997 to 2000. Archaeological material has been found in six mounds, and about 32,000 artifacts have been collected from the site. The earliest settlement at Mehrgarh—located in the northeast corner of the site—was a small farming village dated between 7000 BCE and 5500 BCE. History Mehrgarh is one of the earliest known sites that shows evidence of farming and herding in South Asia.UNESCO World Heritage. 2004. ''Archaeological Site of Mehrgarh''Hirst, K. Kris. 2005"Mehrgarh". '' Guide to Archaeology ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
