Orthodox Black Tea

Black tea is one of the most widely consumed types of tea in the world. Unlike green tea, black tea undergoes full oxidation, which gives it a distinctive appearance and taste. With its robust profile and versatility, black tea is enjoyed both on its own and as a base for blends, flavored teas, and ready-to-drink products.

1. What Is Orthodox Black Tea?

Black tea is also known as Red tea because it refers to the red liquor it produces after brewing. Black tea is a type of tea made from the leaves of the Camellia sinensis plant that undergo full oxidation during processing. The term “Orthodox” refers to a traditional tea processing method where the tea leaves are kept whole or cut into large pieces, preserving the original characteristics and complex aromatic compounds of the tea leaves.

Undergoing complete oxidation, orthodox black tea has a darker color, stronger flavor, and a more robust infusion compared to less oxidized teas. It is widely associated with a delicate flavor and premium appearance, distinct from industrially processed black teas like CTC.

2. The Production Process of Orthodox Black Tea

In the traditional tea-making process, tea leaves undergo wilting, rolling, complete oxidation, and drying stages, each carefully controlled to promote gradual flavor development. The leaves are handled gently to preserve their large shape, resulting in teas with a more pronounced appearance and more complex flavors.

Harvesting

Tea pickers select young leaves and buds from the Camellia sinensis plant, typically the top two leaves and buds. These young leaves contain a high concentration of polyphenols, amino acids, and enzymes essential for flavor development during oxidation. Spring to early summer is ideal for harvesting tea leaves at the highest quality.

Withering

Freshly picked leaves are spread on bamboo trays or mesh racks for 12-18 hours in well-ventilated rooms. This step helps slowly reduce the moisture content by 60-70%, making leaves soft and pliable. Additionally, withering initiates early biochemical changes within the leaves. These changes prepare the leaf cells for oxidation and contribute to aroma development in the later stages.

Rolling

Once adequately withered, the leaves are rolled by hand or using cylindrical rolling machines. In orthodox processing, rolling is carefully controlled to avoid breaking the leaf too much. This step breaks cell walls to release enzymes and juices, allowing oxidation to occur evenly across the leaf surface. Rolling also shapes the leaf, such as a twisted or curled appearance.

Oxidation

The rolled leaves are spread in thin layers and left for up to eight hours for oxidation in a controlled environment. Oxidation in the black tea process is also called “fermentation”, though it is technically an enzymatic reaction. Here, polyphenols are transformed into theaflavins and thearubigins, which contribute to black tea’s dark color, body, and complex flavor. The leaves transform from green to copper to reddish-brown. The longer the leaves are exposed to oxygen, the darker the color.

Drying

Once the desired oxidation level is reached, the leaves are dried using hot air to halt enzymatic activity. High heat deactivates the enzymes and reduces moisture to about 3%, ensuring shelf life and preventing further chemical change. This step also helps fix the developed aroma and flavor, locking in the characteristics formed during oxidation. Proper drying is essential to maintaining consistency and quality in orthodox black tea.

Sorting, grading, and packaging

After drying, the tea is sorted and graded according to leaf size, shape, and appearance. Orthodox black tea typically includes whole-leaf, broken-leaf, and smaller grades, each suited to different brewing preferences. The final step is packing orthodox black tea in PP/PE bags, vacuum bags, or airtight cans, depending on the purposes and transportation methods.

3. Key Characteristics of Orthodox Black Tea

Color and appearance

Dry orthodox black tea leaves are well-formed, twisted, and wiry, ranging from dark brown to black with occasional golden or silver tips (unopened buds). When brewed, the tea produces a clear infusion with amber to deep reddish-brown tones, depending on oxidation level. Premium teas often show a “golden ring” or reddish halo around the cup’s edge, indicating quality and proper oxidation.

Flavor and aroma

Black tea flavor is generally bold, robust, and full-bodied. Originating from a complete oxidation process, it possesses typical flavor notes such as malty, earthy, and smoky. It also has slightly sweet or mildly astringent characteristics, depending on origin and oxidation level.

The aroma of black tea is complex and rich, generally described as earthy, slightly smoky, with layered notes such as dried fruit, cocoa, caramel, or subtle floral hints. High-quality orthodox teas release their aroma slowly when brewed, so the fragrance develops in layers and changes over time, creating a richer and more enjoyable experience.

Nutritional profile

Orthodox black tea contains 40-70 mg of caffeine per cup, providing gentle stimulation and a substantial energy boost. Rich in polyphenols like theaflavins and thearubigins, it contributes to the antioxidant properties of the body and supports heart health. Black tea also contains small amounts of potassium, manganese, fluoride, and B vitamins, making it an ideal choice for daily mornings.

4. Typical Orthodox Black Tea Grades

Black tea OPA	Full name: Orange Pekoe A OPA is a large leaf of Vietnamese black tea. It’s long, bold leaf tea with slightly twisted tea leaves. This grade takes a little bit more time to brew compared to other tea grades but has a unique taste compared to other smaller grades.
Black tea OP	Full name: Black tea Orange Pekoe Black tea OP offered by FGC is the fine grade of tea, made of slightly wiry and slightly twisted leaves and buds, sometimes containing some white tips. It is usually a tea made with the top 2 leaves and one bud from a tea branch. FGC offered three main Black tea OP varieties classified by its size: Black Tea OP long leaf size Black tea OP medium leaf size Black tea OP short leaf size
Black tea BOP	Full name: Broken Orange Pekoe Black tea BOP consists of neat small broken leaves without any other particles. It usually consists of a few silvery tips. This tea has a very strong taste in comparison with other grades.
Black tea FBOP	Full name: Flowery Broken Orange Pekoe Vietnamese Black tea FBOP is just a smaller grade after BOP grade. This tea has short, slightly wiry, less twisted broken leaves and consists of a few tips.
Black tea Pekoe	This tea grade is one of the most popular grades we offer and is the most expensive grade. Vietnamese black tea pekoe is made of young tender tea leaves and buds. Leaves of this grade are shorter, curly, and not much wiry. The tea has a curly round appearance, strong taste, and aroma.
Black tea PS	Full name: Pekoe Souchong Vietnamese black tea PS is a flaky leaf grade with a neat appearance. The tea consists of leaves that are slightly curly but fully open.
Black tea BPS	Full name: Broken Pekoe Souchong Vietnamese black tea BPS is a smaller grade just after PS.
Black tea Fanning	Vietnamese black tea fanning are finely broken pieces of tea leaf that still have a coarse texture. This tea is often used in producing filter tea bags. They are the smallest pieces of tea that are left over after sieving other bigger leaf grades.
Black tea Dust	Vietnamese black tea Dust is fine powder tea, much finer than fanning grades. It is tea leftover from producing other higher tea grades. This tea type is also used in producing filter tea bags.