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Black tea

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Black tea is a flavorful beverage made from the leaves of the Camellia sinensis shrub.

TeaLeaves
TeaLeaves

While many types of tea come from this same plant, black tea is unique because it undergoes more oxidation than green, white, or oolong teas. In many East Asian languages, the drink is actually called "red tea." This name describes the color the leaves turn during processing. Because black tea retains its flavor for several years, it has a long history as a major article of trade. In places like Mongolia, Tibet, and Siberia, compressed bricks of black tea even functioned as a form of currency well into the 19th century.

Agriculture---Tea
Agriculture---Tea

The production of black tea begins with the harvest of Camellia sinensis leaves. There are two principal varieties used in the industry. The first is the small-leaved Chinese variety, known as C. sinensis var. sinensis. The second is the large-leaved Assamese plant, or C. sinensis var. assamica. While the small-leaved variety is used for most teas, the Assamese plant was traditionally used mainly for black tea. After harvesting, the leaves are first withered by blowing air on them to reduce moisture.

There are two main mechanical ways to process these withered leaves: the orthodox method and the CTC method. The orthodox method can be done by hand or by machine to create high-quality loose tea. In this process, leaves are heavily rolled using a cylindrical rolling table or a rotorvane. A rotorvane, created by Ian McTear in 1957, uses an auger to push leaves through a cylinder to crush them. The CTC method, or "crush, tear, curl," was developed by William McKercher in 1930. CTC machines use contra-rotating rotors to shred leaves into very fine particles. This method is highly efficient for producing the tea used in most tea bags.

A critical step in both methods is oxidation. Although some people call this fermentation, no actual fermentation occurs. Instead, an enzyme called polyphenol oxidase becomes active. This enzyme reacts with the air to change the chemical makeup of the leaf. The amount of oxidation determines the tea's color and flavor profile. To stop the oxidation at the right moment, the leaves must be dried. This drying process arrests the chemical changes so the tea reaches its intended taste.

Black tea grading
Black tea grading

Once dried, the tea is sorted into four main grades based on particle size. The highest quality is whole-leaf tea, with the best varieties graded as "orange pekoe." These leaves are less processed and have a coarser texture. Next are broken leaves, which are common in medium-grade loose teas. Below these are fannings and dusts, which are the smallest particles. Fannings and dusts have a large surface area, allowing them to diffuse into water very quickly. This makes them ideal for the fast, strong brew required in tea bags.

Different regions produce teas with very specific characteristics. In China, Lapsang Souchong is famous for being dried over burning pine to create a smoky flavor. Taiwan produces Jinxuan tea, which has an aroma of milk and nectar. In India, Assam tea is known for being full-bodied and malty, while Darjeeling tea is thin-bodied and floral. Sri Lankan Ceylon tea varies by altitude. High-grown teas produce a honey-colored liquor, while low-grown teas produce a strong, burgundy brown liquor. These regional differences allow for a massive variety of tastes.

Many people enjoy tea as a blend rather than a single variety. For example, Earl Grey tea is black tea flavored with bergamot oil. English breakfast tea is a blend of Assam, Ceylon, and Kenyan teas. In South Asia, Masala chai is a popular spiced tea. It combines black tea with spices native to the Indian sub-continent, along with milk and a sweetener. Black tea contains caffeine and no calories, but there is no substantial clinical evidence that it provides specific medical benefits. Regardless, it remains one of the most widely consumed beverages in the world.

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File:Agriculture---Tea.jpg
Agriculture---Tea.jpg
File:Black tea grading.jpg
Black tea grading.jpg
File:TeaLeaves.JPG
TeaLeaves.JPG
File:Black Tea from Kerala IMG 20200924 201237.jpg
Black Tea from Kerala IMG 20200924 201237.jpg
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