Introduction to White Tea Production Techniques

　　White tea is a specialty unique to China. Primarily produced in Fujian Province, records of white tea date back to the Tang and Song dynasties—indeed, the saying "tea is prized for its whiteness" reflects the belief that tea with a pale, silvery-white appearance signifies superior quality. White tea, characterized by its delicate white downy hairs covering the dry leaves, owes its distinctive qualities to two key factors: first, it’s crafted exclusively from tender, multi-hairy young buds and leaves; and second, it undergoes a unique processing method—natural air-drying and gentle sun-drying without any rolling or pan-firing. Today, white tea varieties remain relatively limited, broadly categorized into bud teas (such as Bai Hao Yin Zhen) and leaf teas (like Gong Mei), which are introduced below.

　　1. White Hair Silver Needle Production

　　The manufacturing process for Bai Hao Yin Zhen is as follows: tea buds—withering—baking—screening and sorting—re-baking—packing. The production techniques are now described in detail below.

　　(1) Fresh Leaf Standards

　　Choose mature or post-pruning tea bushes and carefully nurture them. In spring, when the first round of new shoots begins to sprout—specifically, just as the very first true leaf emerges from the bud, before it fully unfolds—harvest the tea buds along with their leaves (in some cases, only the tender bud is picked directly from the shoot). After harvesting, proceed with "needle separation," gently pulling apart the bud and leaf: the delicate bud is reserved for crafting premium Silver Needle tea, while the flattened leaf is either incorporated into White Peony raw materials or repurposed for making red or green teas. However, if harvesting occurs too late—when the first or second leaves have already unfurled—the resulting buds become slender with elongated stems, their fine downy hairs become sparse, the bud surface starts to flatten, and the overall color shifts toward a greenish hue, significantly reducing the quality of the final product. Meanwhile, during summer and autumn, the tea buds are smaller and less robust, making them unsuitable for producing high-quality white tea.

　　(2) Manufacturing Process

　　The initial processing technique for Bai Hao Yin Zhen tea varies slightly depending on the region of origin: ① Fuding Method: Tea buds are evenly spread in a thin layer on a water sieve—a large bamboo sieve with widely spaced holes, approximately 100 cm in diameter. Each hole is roughly 1.4 cm square, and the woven bamboo strips are about 1 cm wide. Importantly, the tea buds should not overlap. About 0.25 kg of leaves are placed per sieve, which is then set atop a rack to air-dry in the sun without turning—this prevents mechanical damage that could cause the buds to turn reddish. On clear, sunny days, the tea is left to dry naturally until it reaches 80–90% moisture content, after which it’s gently baked using a traditional baking basket. A sheet of white paper is placed directly beneath the tea inside the basket, and each basket holds 0.125 kg of buds. The oven temperature is carefully maintained between 30°C and 40°C. If the heat is too high or the bud layer too thick, the buds may develop a burnt-red color and lose their pure aroma. Conversely, insufficient heat can lead to darkening of the buds, while excessive heat causes them to turn yellow instead of retaining their characteristic white hue. In cases of humid weather, when sun-drying only achieves 60–70% dryness after one day, the process should continue the next day until the tea reaches 80–90% dryness before being baked. If rain sets in before the tea can reach even 60–70% dryness during the day—or if the tea dries only to 60–70% on a rainy day—the remaining moisture must be removed immediately that evening or the following morning by gently baking at a low temperature of 40–50°C. On windy and particularly dry days, the tea can first be withered indoors until it has lost about 30% of its weight, followed by a slow, gentle baking process until fully dried.

　　② Zhenghe-style tea production involves spreading tea buds in a well-ventilated, shaded area or under gentle sunlight to wither them until they’re about 70–80% dry. These partially dried buds are then moved to direct sunlight to be fully dried, a process that typically takes around two to three days. If rain interrupts the drying process, the tea must be baked to prevent spoilage. Alternatively, some producers opt for a method that combines sun-drying followed by air-drying: usually, the buds are exposed to mild morning sunlight for 2–3 hours, after which they’re transferred to a shaded, breezy spot to finish drying naturally.

　　Bai Hao Yin Zhen, harvested on clear days with north winds (when relative humidity is low), features white buds and green stems, resulting in superior quality. In contrast, harvesting during south winds—when humidity is high—or on rainy days produces tea with darkened color and blackened stems, leading to lower-quality leaves.

　　The refined process for Bai Hao Yin Zhen is simple: typically, it involves sifting the tea using either a No. 6 or No. 7 sieve, where the material remaining on the sieve is considered top-grade, while the product passing through is classified as second-rate. After sieving, any leaves and impurities are carefully removed, and the tea stems—commonly known as "Yin Zhen Jiao"—are also plucked off. Next, the tea is gently roasted over low heat for about 10 minutes, reducing its moisture content to around 3%. Finally, it’s packed into boxes while still warm. On average, from every kilogram of bud-and-leaf material (consisting of one bud with one leaf), approximately 0.6 kg of pure tea buds ("yinzhen") can be extracted, while the single leaves yield about 0.4 kg. Meanwhile, it takes roughly 7 to 8 kilograms of raw bud-and-leaf material to produce just 1 kilogram of finished Bai Hao Yin Zhen tea.