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54-629: The valley is well known as one of the best locations to view wildlife in Yellowstone national park. The valley was the natural route to Yellowstone Lake as trappers, explorers and natives made their way up the Yellowstone River. On August 29, 1870, when Henry D. Washburn and Gustavus Cheyney Doane ascended Mount Washburn during the Washburn-Langford-Doane Expedition , they saw the great expanse of

108-441: A bath solution containing vegetable tannins, such as found in gallnuts , the leaves of sumac , the leaves of certain acacia trees, the outer green shells of walnuts , among other plants. The use of vegetable tanning is a process that takes longer than mineral tanning when converting rawhides into leather. Mineral tanned leather is used principally for shoes, car seats, and upholstery in homes (sofas, etc.). Vegetable tanned leather

162-520: A counterattack to recapture two guns lost from the Peoria battery. He was subsequently promoted to colonel and given command of the regiment on July 15, 1862. After garrisoning Missouri for the fall and winter, the 18th Indiana was attached to Grant ’s army endeavoring to cross the Mississippi and seize Vicksburg . The 18th Indiana fought at Port Gibson and Champion Hill and took part in

216-427: A high content of glycine , proline , and hydroxyproline , usually in the repeat -gly-pro-hypro-gly-. These residues give rise to collagen's helical structure. Collagen's high content of hydroxyproline allows cross-linking by hydrogen bonding within the helical structure. Ionized carboxyl groups (RCO 2 ) are formed by the action of hydroxide. This conversion occurs during the liming process, before introduction of

270-480: A large factor in how hazardous wastewater results in contaminating the environment. This is especially prominent in small and medium-sized tanneries in developing countries. The UN Leather Working Group (LWG) "provides an environmental audit protocol, designed to assess the facilities of leather manufacturers," for "traceability, energy conservation, [and] responsible management of waste products." Untanned hides can be dried and made pliable by rubbing and stretching

324-461: A northeast course, flowing in view as far as the confluence of the small stream, thence plunged into the Grand Cañon, and hidden from sight. No falls can be seen, but their location is readily detected by the sudden disappearance of the river; beyond this open valley the basin appears to be filled with a succession of low, converging ridges, heavily timbered, and all of about an equal altitude. To

378-403: A process which permanently alters the protein structure of skin, making it more durable and less susceptible to decomposition and coloring. The place where hides are processed is known as a tannery . The English word for tanning is from medieval Latin tannāre , derivative of tannum ( oak bark ), from French tan (tanbark), from old-Cornish tann (oak). These terms are related to

432-430: A salt solution. After the hair was loosened, the tanners scraped it off with a knife. Once the hair was removed, the tanners would " bate " (soften) the material by pounding dung into the skin, or soaking the skin in a solution of animal brains. Bating was a fermentative process that relied on enzymes produced by bacteria found in the dung. Among the kinds of dung commonly used were those of dogs or pigeons. Historically

486-442: A tanning agent. They are then soaked, stretched, dried, and sometimes smoked. Preparing hides begins by curing them with salt to prevent putrefaction of the collagen from bacterial growth during the time lag from procuring the hide to when it is processed. Curing removes water from the hides and skins using a difference in osmotic pressure. The moisture content of hides and skins is greatly reduced, and osmotic pressure increased, to

540-419: Is considered one of the most effective tanning compounds. Chromium-tanned leather can contain between 4 and 5% of chromium. This efficiency is characterized by its increased hydrothermal stability of the skin, and its resistance to shrinkage in heated water. Vegetable tanning uses tannins (a class of polyphenol astringent chemicals), which occur naturally in the bark and leaves of many plants. Tannins bind to

594-403: Is consistent with cross-linking by polychromium species, of the sort arising from olation and oxolation. Before the introduction of the basic chromium species in tanning, several steps are required to produce a tannable hide. The pH must be very acidic when the chromium is introduced to ensure that the chromium complexes are small enough to fit between the fibers and residues of the collagen. Once

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648-416: Is excellent for use in handbags and garments. After application of the chromium agent, the bath is treated with sodium bicarbonate in the basification process to increase the pH to 3.8–4.0, inducing cross-linking between the chromium and the collagen. The pH increase is normally accompanied by a gradual temperature increase up to 40 °C. Chromium's ability to form such stable bridged bonds explains why it

702-419: Is not very flexible. It is used for luggage, furniture, footwear, belts, and other clothing accessories. Wet white is a term used for leathers produced using alternative tanning methods that produce an off-white colored leather. Like wet blue, wet white is also a semifinished stage. Wet white can be produced using aldehydes , aluminum, zirconium, titanium, or iron salts, or a combination thereof. Concerns with

756-428: Is preferred. Once bating is complete, the hides and skins are treated by first soaking them in a bath containing common salt (sodium chloride), usually 1 quart of salt to 1 gallon of hot water. When the water cools, one fluid ounce of sulfuric acid is added. Small skins are left in this liquor for 2 days, while larger skins between 1 week and as much as 2 months. In vegetable tanning, the hides are made to soak in

810-421: Is tawed by soaking in a warm potash alum and salts solution, between 20 and 30 °C (68 and 86 °F). The process increases the hide's pliability, stretchability, softness, and quality. Then, the hide is air dried (crusted) for several weeks, which allows it to stabilize. The use of alum alone for tanning rawhides is not recommended, as it shrinks the surface area of the skin, making it thicker and hard to

864-420: Is the characteristic of the keratin class of proteins that gives strength to hair and wools (keratin typically makes up 90% of the dry weight of hair). The hydrogen atoms supplied by the sharpening agent weaken the cystine molecular link whereby the covalent disulfide bond links are ultimately ruptured, weakening the keratin. To some extent, sharpening also contributes to unhairing, as it tends to break down

918-455: Is the process of treating skins and hides of animals to produce leather . A tannery is the place where the skins are processed. Historically, vegetable based tanning used tannin , an acidic chemical compound derived from the bark of certain trees, in the production of leather. An alternative method, developed in the 1800s, is chrome tanning, where chromium salts are used instead of natural tannins. Tanning hide into leather involves

972-439: Is used as a leather tanning agent, can cause problems in the kidneys and liver and is also considered a carcinogen . Formaldehyde and arsenic, which are used for leather finishing, cause health problems in the eyes, lungs, liver, kidneys, skin, and lymphatic system and are also considered carcinogens. The waste from leather tanneries is detrimental to the environment and the people who live in it. The use of old technologies plays

1026-461: Is used in leather crafting and in making small leather items, such as wallets, handbags and clothes. Chromium(III) sulfate ( [Cr(H 2 O) 6 ] 2 (SO 4 ) 3 ) has long been regarded as the most efficient and effective tanning agent. Chromium(III) compounds of the sort used in tanning are significantly less toxic than hexavalent chromium , although the latter arises in inadequate waste treatment. Chromium(III) sulfate dissolves to give

1080-466: The Grand Loop Road follows the eastern side of the valley near the river. The geothermal features that are scattered around the valley are not as impressive as those of the large geyser basins , but in many case they were the first to be discovered and described by the early explorers. They include Mud Volcano, Mud Geyser , Sulphur Caldron , and Black Dragon Caldron at the southern end of

1134-502: The Sumerians began using leather, affixed by copper studs , on chariot wheels . The process of tanning was also used for boats and fishing vessels: ropes, nets, and sails were tanned using tree bark. Formerly, tanning was considered a noxious or "odoriferous trade" and relegated to the outskirts of town, among the poor. Tanning by ancient methods is so foul-smelling that tanneries are still isolated from those towns today where

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1188-632: The siege operations around Vicksburg , where he commanded a brigade commended for valorous actions during the initial assault upon the enemy fortress in May 1863. After the successful end of the Vicksburg operation, Washburn’s brigade remained with the XIII Army Corps involved in operations up the Teche River, and the successful capture of several Rebel forts. In January 1864, the 18th Indiana

1242-465: The Hayden Valley between Yellowstone Falls and the lake. In Doane's journal he described the valley as seen from Mount Washburn thus: A grassy valley, branching between low ridges, running from the river toward the center of the basin. A small stream rose in this valley, breaking through the ridges to the west in a deep cañon, and falling into the channel of the Yellowstone, which here bears in

1296-522: The Mary Mountain trail. The valley trail parallels the river on the eastern side of the valley from Lake to Canyon, while the Mary Mountain trail skirts the northern edge of the valley along Alum Creek on its way to the Canyon-Lake road. All the rivers, creeks and ponds in the valley are closed to fishing,. Henry D. Washburn Henry Dana Washburn (March 28, 1832 – January 26, 1871)

1350-411: The actual tanning process used vegetable tanning. In some variations of the process, cedar oil , alum , or tannin was applied to the skin as a tanning agent. As the skin was stretched, it would lose moisture and absorb the agent. Following the adoption in medicine of soaking gut sutures in a chromium (III) solution after 1840, it was discovered that this method could also be used with leather and thus

1404-491: The case of Bangladesh, chickens (the nation's most common source of protein). Up to 25% of the chickens in Bangladesh contained harmful levels of hexavalent chromium, adding to the national health problem load. Chromium is not solely responsible for these diseases. Methylisothiazolinone , which is used for microbiological protection (fungal or bacterial growth), causes problems with the eyes and skin. Anthracene , which

1458-459: The collagen proteins in the hide and coat them, causing them to become less water-soluble and more resistant to bacterial attack. The process also causes the hide to become more flexible. The primary barks processed in bark mills and used in modern times are chestnut , oak , redoul , tanoak , hemlock , quebracho , mangrove , wattle (acacia; see catechol ), and myrobalans from Terminalia spp., such as Terminalia chebula . In Ethiopia ,

1512-416: The collagen's carboxyl groups, amine groups from the side chains of the amino acids , and masking agents. Masking agents are carboxylic acids , such as acetic acid , used to suppress formation of polychromium(III) chains. Masking agents allow the tanner to further increase the pH to increase collagen's reactivity without inhibiting the penetration of the chromium(III) complexes. Collagen is characterized by

1566-544: The combined vegetable oils of Niger seed ( Guizotia abyssinica ) and flaxseeds were used in treating the flesh side of the leather, as a means of tawing, rather than of tanning. In Yemen and Egypt , hides were tanned by soaking them in a bath containing the crushed leaves and bark of the Salam acacia (Acacia etbaica; A. nilotica kraussiana). Hides that have been stretched on frames are immersed for several weeks in vats of increasing concentrations of tannin. Vegetable-tanned hide

1620-409: The desired level of penetration of chrome into the substance is achieved, the pH of the material is raised again to facilitate the process. This step is known as basification. In the raw state, chrome-tanned skins are greyish-blue, so are referred to as wet blue . Chrome tanning is faster than vegetable tanning (taking less than a day for this part of the process) and produces a stretchable leather which

1674-425: The end use of the leather, hides may be treated with enzymes to soften them, a process called bating . In modern tanning, these enzymes are purified agents, and the process no longer requires bacterial fermentation (as from dung-water soaking) to produce them. Pickling is another term for tanning, or what is the modern equivalent of turning rawhide into leather by the use of modern chemical agents, if mineral tanning

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1728-562: The fibers with a hide stretcher, and fatting. However the hide will revert to rawhide if not periodically replenished with fat or oil, especially if it gets wet. Many Native Americans of the arid western regions wore clothing made by this process. Smoke tanning is listed among the conventional methods like chrome tanning and vegetable tanning. Impregnation of the hide's cells with formaldehyde (from smoke) offers some microbial and water resistance. Leftover leather would historically be turned into glue . Tanners would place scraps of hides in

1782-602: The grade of brevet brigadier general of volunteers, to rank from December 15, 1864, and the United States Senate confirmed the appointment on February 14, 1865. In the winter of 1864-5, the Nineteenth Corps garrisoned the Savannah area while engaged in raids into Rebel held areas. He mustered out August 26, 1865. On May 4, 1866, President Andrew Johnson nominated Washburn for appointment to

1836-474: The grade of brevet major general of volunteers, to rank from March 13, 1865, for gallant and meritorious service during the war and the United States Senate confirmed the appointment on May 18, 1866. Following the war, Washburn resumed his law practice and returned to politics. He successfully contested as a Republican the election of Daniel W. Voorhees to the Thirty-ninth Congress . He

1890-418: The hair proteins. The isoelectric point of the collagen (a tissue-strengthening protein unrelated to keratin) in the hide is also shifted to around pH 4.7 due to liming. Any hairs remaining after liming are removed mechanically by scraping the skin with a dull knife, a process known as scudding. The pH of the collagen is then reduced so the enzymes may act on it in a process known as deliming. Depending on

1944-406: The hexaaquachromium(III) cation, [Cr(H 2 O) 6 ] , which at higher pH undergoes processes called olation to give polychromium(III) compounds that are active in tanning, being the cross-linking of the collagen subunits. The chemistry of [Cr(H 2 O) 6 ] is more complex in the tanning bath rather than in water due to the presence of a variety of ligands. Some ligands include the sulfate anion,

1998-406: The hides are soaked in clean water to remove the salt left over from curing and increase the moisture so that the hide or skin can be further treated. To prevent damage of the skin by bacterial growth during the soaking period, biocides , typically dithiocarbamates , may be used. Fungicides such as TCMTB may also be added later in the process, to protect wet leathers from mold growth. After 1980,

2052-517: The hypothetical Proto-Indo-European * dʰonu meaning ' fir tree'. (The same word is source for Old High German tanna meaning 'fir', related to modern German Tannenbaum ). Ancient civilizations used leather for waterskins , bags, harnesses and tack, boats, armour , quivers , scabbards , boots , and sandals . Tanning was being carried out by the inhabitants of Mehrgarh in Pakistan between 7000 and 3300 BCE. Around 2500 BCE ,

2106-597: The name first appeared on maps in 1880 in an annual report from superintendent Philetus Norris . The Hayden valley, centrally located in Yellowstone National Park, is approximately 7 miles (11 km) long north to south and 7 miles (11 km) wide east to west and occupies about 50 square miles (130 km) of the park. It lies mostly to the west of the Yellowstone River between Canyon and Yellowstone Lake, in Wyoming. The Canyon to Lake section of

2160-447: The old methods are used. Skins typically arrived at the tannery dried stiff and dirty with soil and gore. First, the ancient tanners would soak the skins in water to clean and soften them. Then they would pound and scour the skin to remove any remaining flesh and fat . Hair was removed by soaking the skin in urine , painting it with an alkaline lime mixture, or simply allowing the skin to putrefy for several months then dipping it in

2214-556: The park, is named for him. Washburn returned to Clinton, Indiana , where he died on January 26, 1871. He was interred in Riverside Cemetery. List of American Civil War brevet generals (Union) [REDACTED]  This article incorporates public domain material from the Biographical Directory of the United States Congress Tanner (occupation) Tanning , or hide tanning ,

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2268-611: The point that bacteria are unable to grow. In wet-salting, the hides are heavily salted, then pressed into packs for about 30 days. In brine -curing, the hides are agitated in a saltwater bath for about 16 hours. Curing can also be accomplished by preserving the hides and skins at very low temperatures. The steps in the production of leather between curing and tanning are collectively referred to as beamhouse operations. They include, in order, soaking, liming , removal of extraneous tissues (unhairing, scudding and fleshing), deliming , bating or puering, drenching, and pickling. In soaking,

2322-508: The process. Chemicals used in tanned leather production increase the levels of chemical oxygen demand and total dissolved solids in water when not disposed of responsibly. These processes also use large quantities of water and produce large amounts of pollutants. Boiling and sun drying can oxidize and convert the various chromium(III) compounds used in tanning into carcinogenic hexavalent chromium , or chromium(VI). This hexavalent chromium runoff and scraps are then consumed by animals, in

2376-522: The south appears a broad sheet of water -- the Yellowstone Lake. Although it is clear that the valley is named in honor of Ferdinand Vandeveer Hayden and his geological surveys of the Yellowstone region (as his 1871 survey led to the creation of the park), there is little definitive evidence as to who actually named the valley. Some credit the Earl of Dunraven , during his visit in 1872, but

2430-403: The tanning agent (chromium salts). Later during pickling, collagen carboxyl groups are temporarily protonated for ready transport of chromium ions. During basification step of tanning, the carboxyl groups are ionized and coordinate as ligands to the chromium(III) centers of the oxo-hydroxide clusters. Tanning increases the spacing between protein chains in collagen from 10 to 17 Å. The difference

2484-407: The touch. If alum is applied to the fur, it makes the fur dull and harsh. Depending on the finish desired, the leather may be waxed, rolled, lubricated, injected with oil, split, shaved, or dyed. The tanning process involves chemical and organic compounds that can have a detrimental effect on the environment. Agents such as chromium, vegetable tannins, and aldehydes are used in the tanning step of

2538-492: The toxicity and environmental impact of any chromium (VI) that may form during the tanning process have led to increased research into more efficient wet white methods. The conditions present in bogs, including highly acidic water, low temperature, and a lack of oxygen, combine to preserve but severely tan the skin of bog bodies . Tawing is a method that uses alum and other aluminium salts , generally in conjunction with binders such as egg yolk, flour, or other salts. The hide

2592-418: The use of pentachlorophenol and mercury -based biocides and their derivatives was forbidden. After soaking, the hides are treated with milk of lime (a basic agent) typically supplemented by "sharpening agents" (disulfide reducing agents) such as sodium sulfide , cyanides , amines , etc. This: The weakening of hair is dependent on the breakdown of the disulfide link of the amino acid cystine , which

2646-508: The valley and Sulphur Spring in the Crater Hills group further north and west of the river. The Hayden Valley is outstanding wildlife habitat and is frequented by buffalo , elk , grizzly bears , coyote , wolves , and a host of smaller mammals and birds. To protect this habitat and prevent disturbing wildlife, the valley is closed to off-trail foot travel. Two trails make the valley accessible for hikers—the Hayden Valley trail and

2700-711: Was admitted to the bar in 1853. He commenced the practice of law in Newport, Indiana . Entering politics, he served as the county auditor from 1854–1861. With the outbreak of the Civil War, he enlisted in the Union Army on August 16, 1861, serving as lieutenant colonel of the Eighteenth Regiment, Indiana Volunteer Infantry. He distinguished himself at the Battle of Pea Ridge by leading the 18th Indiana in

2754-688: Was a U.S. Representative from Indiana and a colonel and was breveted twice as brigadier general and major general in the Union Army during the American Civil War . Born in Woodstock, Vermont , Washburn attended the common schools. He became a tanner and a currier , and taught school for several years. He moved to Vermillion County, Indiana , in 1850. He graduated from the New York State and National Law School and

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2808-487: Was adopted by tanners. The tanning process begins with obtaining an animal skin. When an animal skin is to be tanned, the animal is killed and skinned before the body heat leaves the tissues. This can be done by the tanner, or by obtaining a skin at a slaughterhouse, farm, or local fur trader. Before tanning, the skins are often dehaired, then have fat, meat and connective tissue removed. They are then washed and soaked in water with various compounds, and prepared to receive

2862-545: Was reelected to the Fortieth Congress and served from February 23, 1866, to March 3, 1869. He was not a candidate for renomination in 1868 to the Forty-first Congress. He was appointed surveyor general of Montana in 1869 and served until his death. In 1870 he headed the Washburn-Langford-Doane Expedition to explore what would become Yellowstone National Park . Mount Washburn , located within

2916-543: Was sent to Virginia where it participated in several stiff skirmishes. In August 1864, the 18th Indiana was attached to the 4th Brigade, 2nd Division ( Grover ) of Emory ’s XIX Army Corps . During Sheridan ’s campaign to clear the Shenandoah Valley , Washburn commanded the 4th Brigade during heavy fighting at the battles of Opequon , Fisher’s Hill and Cedar Creek . On December 12, 1864, President Abraham Lincoln nominated Washburn for appointment to

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