Leather

Leather is a strong, flexible material made from the skins of animals. It is made through a process called tanning, which uses chemicals to keep the skins from decaying. The most common animals used for leather are cattle, sheep, goats, horses, buffalo, pigs, hogs, ostriches, and aquatic animals like seals and alligators.

People have used leather for thousands of years to make useful things. Leather is used to make clothing, shoes, handbags, furniture, tools, and sports equipment. Because leather is strong and lasts a long time, these items can stay in good shape for many years. Today, China and India make the most leather.

Some people worry about how leather is made. They say that places that make leather, called tanneries, can sometimes be bad for the health of people nearby and for the environment.

Production processes

Making leather has three main steps: preparing the hide, tanning it, and finishing it. First, hides are cleaned and treated so they are ready for tanning. Next, tanning makes the hides strong and flexible so they don’t decay. Different methods can be used for tanning, such as using plant materials or special chemicals. Finally, some leathers get extra treatments to improve their look and feel.

Main article: Tanning (leather)

There are several ways to tan leather. One old method uses plants to create soft, light brown leather. Another common way uses chromium, which makes the leather very flexible. Some leathers use other chemicals to stay safe for babies and cars. Each method gives leather different qualities and uses.

Grades

Leather comes in different grades, which describe its quality and feel. Top-grain leather is made from the outer layer of an animal hide and is strong and last a long time. Full-grain leather is the best quality and looks nice over time. It is often used for furniture and shoes.

Split leather comes from the lower layers of the hide. Bicast leather looks like top-grain leather but is made from split leather coated with a special material. Patent leather has a very shiny finish, and suede is soft and often made from younger animals. Bonded leather is made from small pieces of leather stuck together with special materials.

The term "genuine leather" is used in different ways and may not always mean one specific type of leather.

Animals used

Today, most leather comes from cattle hides. Other animals used include sheep, goats, and pigs.

Horse hides are used to make very strong leathers. Shell cordovan is a special kind of horse leather. It is shiny and stays smooth.

Lamb and deerskin are used for soft, fancy leather in clothes. Deerskin is often used in work gloves and indoor shoes.

Skins from animals like alligator, crocodile, and snake are used because of their unique patterns. The Argentine black and white tegu is one of the most used reptiles for leather.

Kangaroo leather is used for things that need to be strong and bendable, like bullwhips. Some motorcyclists like kangaroo leather for motorcycle leathers. It is also used for soccer shoes (like Adidas Copa Mundial), and boxing speed bags.

Although ostriches were once raised for their feathers, they are now also used for meat and leather. Ostrich leather has a special bumpy look and can be used for many things like furniture, shoes, car parts, accessories, and clothes.

In Thailand, stingray leather is used to make wallets and belts. This leather is tough and durable.

For the same thickness, fish leather is usually much stronger because of its crossed fibers.

Environmental impact

Making leather can harm the environment in a few ways. Raising animals like cows for leather creates a carbon footprint. The process of treating animal skins uses chemicals that can pollute the air and water.

Making leather needs a lot of water and creates waste water that can harm rivers and lakes. Leather takes a long time to break down in nature. Some places don't have strong rules to stop pollution from leather factories, which can hurt the environment and people living nearby.

Role of enzymes

Main article: Bating (leather)

Different helpers, called enzymes, help make leather. Some of these helpers, like proteases, lipases, and amylases, soften and clean the animal skin. Proteases are the most common helpers. They break down some parts of the skin but leave important parts like collagen and keratin untouched. This step is called bating.

Lipases help remove natural fats from the skin. Amylases are used less often; they help make the skin softer and stronger.

Preservation and conditioning

Leather can break down over time because its fibers weaken. A problem called red rot can make leather feel different and turn to powder, especially if it gets too hot or humid. This damage can’t be undone, but special treatments can help keep leather in good shape.

Leather can dry out in very dry air, changing its structure forever. It can also get damaged by sunlight, air pollution, or certain oils. To care for leather, use a slightly damp cloth and avoid getting it very wet. Products like conditioners, saddle soap for cleaning, and shoe polish can help keep leather looking good.

In modern culture

Leather is tough and can resist scratches and wind, making it useful for hard jobs. People who work with cows, called cowboys, often wear leather pants called chaps. When people started flying airplanes, they wore leather jackets and helmets for protection. When motorcycles were invented, riders began wearing heavy leather jackets to protect themselves from injuries and wind. Some also wear chaps or leather pants to protect their legs.

Because leather is flexible, it can be shaped into balls and protective gear. Many sports use leather equipment, like baseball gloves and the balls used in cricket and football games.

Some music groups, especially rock, heavy metal, and punk bands from the 1970s and 80s, are famous for wearing leather clothes. Some car and truck seats can also be made from leather.

Religious sensitivities

In some countries, people follow religions that have rules about what materials they can use. Shops often tell customers where their leather comes from to help people follow these rules. For example, a Muslim might want to avoid products made from pigskin, and a Hindu might avoid cattleskin. Because of these rules, there is more demand for leathers that many people can use, like ostrich or deer leather.

Some religions, like Judaism, have special days when wearing leather shoes is not allowed. Jainism teaches that using leather is wrong because it comes from animals.

Alternatives

People have made materials that look like leather but are not from animal skins. These are usually made from a plastic called polyurethane or vinyl put on top of cloth. Some of these fake leathers are called "pleather" or have brand names like Naugahyde.

Another kind of leather is made in laboratories. Scientists grow leather using tiny cells, or they use materials from mushrooms and waste from the meat industry. Leather made from mushrooms breaks down naturally when it is no longer needed.