Ivory

Ivory is a hard, white material.

It comes from animal teeth and tusks. Most ivory comes from elephants. But it can also come from whales or walruses.

People use ivory to make many things. They carve it into small toys or combs. It was once used to make piano keys.

Some people even use it for jewelry.

Making things from ivory can hurt animals. Many elephants were killed to get their tusks. Because of this, selling ivory is now against the law in many lands. We can use other things to make art instead.

Ivory is a hard, white material.

It comes from the teeth and tusks of animals. Most ivory comes from elephants. It can also come from walruses, whales, or hippos.

Ivory is made of dentin. Dentin is a strong part of a tooth. It is made of tiny fibers and minerals. This makes ivory very hard and tough.

People have used it for a long time. In the past, they made piano keys and combs. They also carved beautiful art and religious objects.

Today, using ivory can be a big problem. Many animals were killed to get their tusks. In just ten years, the African elephant population dropped a lot. Because of this, selling ivory is now illegal in many places.

We can now use synthetic ivory. This is a man-made version. It does not require taking material from animals. We can also use tagua nuts to make carvings. This helps keep animals safe.

Ivory is a hard, white material used for many things.

It mostly comes from the tusks of elephants. However, it can also come from the teeth of other animals. These include walruses, hippos, whales, and even narwhals. Scientists say ivory is mostly made of dentin. Dentin is a part of a tooth that is very strong. This material is special because it is tough and hard.

It is even harder than bone.

How does ivory work so well? It is a mix of collagen fibers and minerals. These fibers create a special structure inside the material. When you polish ivory, you might see a checkerboard pattern. This is called a Schreger pattern. This pattern helps stop cracks from spreading through the ivory. The material is also different depending on which way you measure it. It is harder in some directions than in others. This makes it a very useful material for carving.

People have used ivory for a very long time. The trade of ivory goods began in the Indus Valley. In the Harappan civilization, people made many small items. They carved pins, combs, dice, and even game pieces. In ancient China, ivory moved along the Northern Silk Road. During the Edo period in Japan, people made small carvings called netsuke. In the 1800s, the United States used a lot of ivory. Towns in Connecticut became famous for making ivory piano keys. This was a very big industry back then.

Ivory has been used for many different jobs. It can be carved into beautiful art or religious objects. People once used it to make false teeth and fans. It was also used for billiard balls and piano keys. In Southeast Asia, officials used ivory seals to sign documents.

In the Philippines, it was used for the faces of religious images. Some artists even used it to make the white of eyes in statues. Even today, people use it for jewelry and furniture inlays.

Today, using natural ivory is a very serious matter. Many animals, like African and Asian elephants, are threatened. In the 1980s, the African elephant population dropped from 1.3 million to 600,000. This happened because people wanted ivory. Now, the trade of ivory from these species is illegal.

We can now use synthetic ivory instead. This is a man-made version that does not hurt animals. We can also use tagua nuts for carving. These new ways help keep living things safe.

Ivory is a dense, white material sourced from the tusks and teeth of various mammals.

While elephant tusks are the most famous source, ivory can also come from walruses, hippopotamuses, whales, and narwhals. Chemically, ivory consists mainly of dentin, which is a structural part of teeth and tusks. This material is a biomineral composite made of collagen fibers mineralized with hydroxyapatite. This specific composition provides ivory with remarkable mechanical properties, such as high stiffness and toughness. Because it is so durable, ivory has been a highly valued material for both art and functional objects throughout human history.

The strength of ivory comes from its unique microscopic structure. The dentin is built from a network of mineralized collagen fibers. When ivory is polished, these fibers often create a visible checkerboard pattern known as the Schreger pattern. Scientists believe this pattern helps prevent crack propagation by dispersing stress throughout the material. Ivory also shows a property called anisotropy, meaning its strength changes depending on the direction. For example, the circumferential planes of a tusk can be up to 25% harder than the radial planes. This directional viscoelasticity allows the material to handle repeated wear, which is why it was once used for piano keys.

Historically, the trade of finished ivory products began in the Indus Valley. In the Harappan civilization, ivory was a major product used for trading. Archaeologists have found many Harappan ivory items, such as kohl sticks, pins, awls, and dice.

In ancient China, ivory moved along the Northern Silk Road as early as the first century BC. Southeast Asian kingdoms also sent Indian elephant tusks to China as part of annual tribute caravans. These items were used for everything from religious images to the stems of opium pipes.

Different cultures used ivory in very specific ways. In the Greco-Roman world, artists used ivory to create high-value works of art and religious objects. They even used small pieces of ivory to represent the white of the eyes in statues. In Southeast Asia, ivory was prized for its ability to create airtight seals in containers. Officials in countries like Myanmar and Thailand used carved ivory seals to stamp official documents. In the Philippines, the Santero culture used ivory to craft the faces and hands of Catholic icons.

During the 19th century, the ivory industry grew significantly in the United States. In the 1860s, towns like Deep River and Ivoryton in Connecticut became major centers for ivory milling. This was driven by a massive demand for ivory piano keys. At one point, up to 90 percent of all ivory imported into the U.S. was processed in Connecticut.

In Japan, the Edo period saw the rise of popular ivory carvings called netsuke. Later, during the Meiji period, the Japanese government promoted ivory crafts at World's Fairs, where they were admired by Western museums and the Imperial Family.

However, the demand for ivory has had a devastating impact on animal populations. In the first half of the 20th century, Kenyan elephant herds were devastated by the demand for piano keys. In 1930, it was estimated that acquiring 40 tons of ivory required killing approximately 700 elephants. The most dramatic decline occurred in the 1980s. During that decade, the African elephant population plummeted from 1.3 million to roughly 600,000. This massive loss was partly due to the increased demand for ivory hanko, or name seals, in Japan.

Today, the international trade of natural ivory from threatened species is strictly regulated or illegal. Organizations like CITES work to manage the trade to prevent further species decline. Because of these protections, many countries have banned the sale of elephant ivory entirely. To replace natural ivory, humans have developed synthetic substitutes. We can also use the tagua nut, which can be carved similarly to ivory. These alternatives allow us to create beautiful objects without harming endangered animals.