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Leather Goods
Leather is a strong, flexible and durable material obtained from the tanning, or chemical treatment, of animal skins and hides to prevent decay. The most common leathers come from cattle, sheep, goats, equine animals, buffalo, pigs and hogs, ostriches, and aquatic animals such as seals and alligators. Leather can be used to make a variety of items, including clothing, footwear, handbags, furniture, tools and sports equipment, and lasts for decades. Leather making has been practiced for more than 7,000 years and the leading producers of leather today are China and India. Critics of tanneries claim that they engage in unsustainable practices that pose health hazards to the people and the environment near them. Production processes The leather manufacturing process is divided into three fundamental subprocesses: preparatory stages, tanning, and crusting. A further subprocess, finishing, can be added into the leather process sequence, but not all leathers receive finishin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Putrefaction
Putrefaction is the fifth stage of death, following pallor mortis, livor mortis, algor mortis, and rigor mortis. This process references the breaking down of a body of an animal Post-mortem interval, post-mortem. In broad terms, it can be viewed as the decomposition of proteins, and the eventual breakdown of the cohesiveness between tissues, and the liquefaction of most organs. This is caused by the decomposition of organic matter by bacterial or fungal digestion, which causes the release of gases that infiltrate the body's tissues, and leads to the deterioration of the tissues and organs. The approximate time it takes putrefaction to occur is dependent on various factors. Internal factors that affect the rate of putrefaction include the age at which death has occurred, the overall structure and condition of the body, the cause of death, and external injuries arising before or after death. External factors include environmental temperature, moisture and air exposure, clothing, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tan (color)
Tan is a pale tone of brown. The name is derived from tannum (oak bark) used in the tanning of leather. The first recorded use of ''tan'' as a color name in English was in the year 1590. Colors which are similar or may be considered synonymous to tan include: tawny, tenné, and fulvous. __TOC__ Variations of tan Sandy tan Displayed at right is the color ''Sandy tan''. This color was formulated by Crayola in 2000 as a Crayola marker color. Tan (Crayola) Displayed at right is the orangish tone of tan called ''tan'' since 1958 in Crayola crayons and 1990 in Crayola markers. Windsor tan Displayed at right is the color ''Windsor tan''. The first recorded use of ''Windsor tan'' as a color name in English was in 1925. Tuscan tan Displayed at right is the color ''Tuscan tan''. The first recorded use of ''Tuscan tan'' as a color name in English was in 1926. The normalized color coordinates for Tuscan tan are identical to café au lait and French beige, whi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bark Mill
Bark mills, also known as Catskill's mills, are water, steam, horse, ox or wind-powered edge mills used to process the bark, roots, and branches of various tree species into a fine powder known as tanbark, used for tanning leather. This powdering allowed the tannin to be extracted more efficiently from its woody source material.Muspratt Bark Mill Retrieved : 2011-02-03 A barker would strip the from trees so that it might be ground in such mills, and the dried bark was often stored in bark houses. Machinery Various machinery was used to chop, grind, riddle and pound the bark. These included Farc ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tanbark
Tanbark is the Bark (botany), bark of certain species of trees, traditionally used for Tanning (leather), tanning Hide (skin), hides into leather. The words "tannin", "Tanning (leather), tanning", "Tan (color), tan," and "Tawny (color), tawny" are derived from the Medieval Latin , "to convert into leather." Bark mills are horse- or oxen-driven or water-powered edge mills and were used in earlier times to shred the tanbark to derive tannins for the leather industry. A "barker" was a person who stripped bark from trees to supply bark mills. Tanbark around the world In Europe, oak is a common source of tanbark. Quercitannic acid is the chief constituent found in oak barks. The bark is taken from young branches and twigs in oak coppices and can be up to 4 mm thick; it is grayish-brown on the outside and brownish-red on the inner surface. In some areas of the United States, such as central Pennsylvania and northern California, "mulch" is often called tanbark, even by manufactu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vegetable Matter
Vegetables are edible parts of plants that are consumed by humans or other animals as food. This original meaning is still commonly used, and is applied to plants collectively to refer to all edible plant matter, including flowers, fruits, stems, leaves, roots, and seeds. An alternative definition is applied somewhat arbitrarily, often by culinary and cultural tradition; it may include savoury fruits such as tomatoes and courgettes, flowers such as broccoli, and seeds such as pulses, but exclude foods derived from some plants that are fruits, flowers, nuts, and cereal grains. Originally, vegetables were collected from the wild by hunter-gatherers and entered cultivation in several parts of the world, probably during the period 10,000 BC to 7,000 BC, when a new agricultural way of life developed. At first, plants that grew locally were cultivated, but as time went on, trade brought common and exotic crops from elsewhere to add to domestic types. Nowadays, most ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tannin
Tannins (or tannoids) are a class of astringent, polyphenolic biomolecules that bind to and Precipitation (chemistry), precipitate proteins and various other organic compounds including amino acids and alkaloids. The term ''tannin'' is widely applied to any large polyphenolic compound containing sufficient hydroxyls and other suitable groups (such as carboxyls) to form strong complexes with various macromolecules. The term ''tannin'' (from scientific French ''tannin'', from French ''tan'' "crushed oak bark", ''tanner'' "to tan", cognate with English language, English ''tanning'', Medieval Latin ''tannare'', from Proto-Celtic ''*tannos'' "oak") refers to the abundance of these compounds in oak Bark (botany), bark, which was used in Tanning (leather), tanning animal Hide (skin), hides into leather. The tannin compounds are widely distributed in many species of plants, where they play a role in protection from predation (acting as pesticides) and might help in regulating plant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neatsfoot Oil
Neatsfoot oil is a yellow oil rendered and purified from the shin bones and feet (but not the hooves) of cattle. "Neat" in the oil's name comes from an Old English word for cattle. Neatsfoot oil is used as a conditioning, softening and preservative agent for leather. In the 18th century, it was also used medicinally as a topical application for dry scaly skin conditions. Despite its name, "prime neatsfoot oil" (or "neatsfoot oil compound") is a blend of actual neatsfoot oil and non-animal oils, generally mineral or other petroleum-based oils. Characteristics Fat from warm-blooded animals normally has a high melting point, becoming hard when cool, but neatsfoot oil remains liquid at room temperature. This is because the relatively slender legs and feet of animals such as cattle are adapted to tolerate and maintain much lower temperatures than that of the body core, using countercurrent heat exchange in the legs between warm arterial and cooler venous blood. Other body ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mink Oil
Mink oil is an oil used in medical and cosmetic products. It is obtained by the Rendering (animal products), rendering of mink fat which has been removed from pelts bound for the fur industry. In spite of the term on products labeled “mink oil“, many commercial versions of so-named leather conditioner contain no natural mink oil. Characteristics Mink oil is a source of palmitoleic acid, which possesses physical properties similar to human sebum. Because of this, mink oil is used in several medical and cosmetic products. Mink oil is also used for treating, conditioning and preserving nearly any type of leather. Botanical alternatives to mink oil as a source of palmitoleic acid include macadamia oil (''Macadamia integrifolia'') and sea buckthorn oil (''Hippophae rhamnoides''), both of which contain as much or more palmitoleic acid (17% and 19–29% respectively) than does mink oil (17%). Mink oil and its fatty acids are unique among animal-derived fats and oils. The unsatur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Currying (leather)
In mathematics and computer science, currying is the technique of translating a function that takes multiple arguments into a sequence of families of functions, each taking a single argument. In the prototypical example, one begins with a function f:(X\times Y)\to Z that takes two arguments, one from X and one from Y, and produces objects in Z. The curried form of this function treats the first argument as a parameter, so as to create a family of functions f_x :Y\to Z. The family is arranged so that for each object x in X, there is exactly one function f_x. In this example, \mbox itself becomes a function that takes f as an argument, and returns a function that maps each x to f_x. The proper notation for expressing this is verbose. The function f belongs to the set of functions (X\times Y)\to Z. Meanwhile, f_x belongs to the set of functions Y\to Z. Thus, something that maps x to f_x will be of the type X\to \to Z With this notation, \mbox is a function that takes objects from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tumble Finishing
Tumble finishing, also known as tumbling or rumbling, is a technique for smoothing and polishing a rough surface on relatively small parts. In the field of metalworking, a similar process called barreling, or barrel finishing,Degarmo, p. 781. works upon the same principles. Tumbled stones are made with rock tumblers in a process very similar to the natural processes that produce "sea glass" or "beach glass". Stones Tumbling of rocks as a lapidary technique for rock polishing usually requires a plastic or rubber-lined barrel loaded with a consignment of rocks, all of similar or the same hardness, some abrasive grit, and a liquid lubricant. Silicon carbide grit is commonly used, and water is a universal lubricant. The barrel is then placed upon slowly rotating rails so that it rotates. The optimal speed of rotation depends on the size of the tumbler barrel and materials involved. Vibratory finishing process can be used instead. A well-chosen speed for stone polishing causes t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glaze (painting Technique)
A glaze is a thin transparent or semi-transparent layer on a painting which modifies the appearance of the underlying paint layer. Glazes can change the chroma, value, hue and texture of a surface. Glazes consist of a great amount of binding medium in relation to a very small amount of pigment. Drying time will depend on the amount and type of paint medium used in the glaze. The medium, base, or vehicle is the mixture to which the dry pigment is added. Different media can increase or decrease the rate at which oil paints dry. Often, because a paint is too opaque, painters will add a medium like linseed oil or alkyd to the paint to make them more transparent and pliable for the purposes of glazing. While these media are usually liquids, there are solid and semi-solid media used in the making of paints as well. For example, many classical oil painters have also been known to use ground glass and semi-solid resins to increase the translucency of their paint. Oil painting In oil p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
