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Pine tar

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Pine tar is a dark, thick liquid produced from pine wood. It is a versatile substance used for many different purposes. People use it to protect wood from water and rot. It is also used in medicines and various industrial products. This substance is important because of its unique chemical properties. These properties allow it to act as a sealant and a germ-killer.

Pine-tar bat
Pine-tar bat

To create pine tar, people use a process called destructive distillation. This is also known as anoxic carbonization. In this process, pine wood is placed inside a closed container. This container is anoxic, which means it has no oxygen inside. Heat and pressure are then applied to the wood very quickly. This causes the wood to decompose into two main products. The first product is charcoal. The second product is the liquid pine tar. The exact makeup of the tar changes based on the process. Factors like temperature, duration, and the type of wood affect the result. The age of the trees and the soil they grew in also matter.

Scientists have identified many different parts within pine tar. When studying tar from the Pinus nigra tree, they found 32 specific compounds. These compounds make up 95.5% of the total mixture. One major component is Methyl dehydroabietate, which accounts for 22.44% of the tar. Another important part is Dehydroabietic acid, which makes up 14.59%. Other parts include Retene at 10.08% and Isopimaral at 6.18%. These substances are mostly resin acids and hydrocarbons. These specific chemicals give pine tar its ability to preserve wood and fight germs.

Humans have been making pine tar for thousands of years. In Sweden, researchers found cone-shaped pits used for production. One of these sites is very old. It dates back to between 540 and 380 BCE. This may be the oldest known tar production facility in the world. During classical antiquity, the Roman writer Pliny the Elder described tar production. He noted that wood was chopped into small pieces called billets. These billets were then heated in a furnace. He wrote that tar was used to coat ships for many purposes.

In the 17th century, the demand for pine tar grew very quickly. European nations were building large naval and merchant fleets. These ships required tar and pitch for waterproofing and caulking. In Finland, large-scale production began during the early 1600s. By the late 17th century, tar was Sweden's third most valuable export. Much of this was called "Stockholm tar" because of a royal monopoly. This tar was considered the highest quality available. In North America, the demand was so high that people from North Carolina became known as "Tar Heels."

Pine tar has many specialized uses in the modern world. In the maritime industry, it is used to seal wooden boats. It is often mixed with gum turpentine and boiled linseed oil. First, a thin coat is applied to help the tar seep into the wood fibers. This allows the tar to fill small holes and gaps. Later, a thicker mixture is applied to create a strong seal. It is also used to weatherproof hemp rope. In sports, baseball players apply pine tar to the handles of their bats. This helps them maintain a better grip. However, Major League Baseball rules limit this to the bottom 18 inches of the bat.

Medical and veterinary uses are also quite common. Pine tar is used as an antiseptic for skin conditions like eczema and psoriasis. It is also used in veterinary medicine to treat the hooves of horses and cattle. In poultry farming, it can be used on chickens. A smear of tar on a wound can stop other birds from pecking at it. While some older studies suggested risks, recent tests in Australia show it is generally safe. The main risk is sensitivity for people with severe skin conditions. This shows how a substance from a tree can connect to so many different parts of life.

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