Classification and Origin
Classification origin: Form and Its Logic
The character 方 means "square, regular four-sided shape." In common usage, 方砖 is distinguished from a "regular brick": 砖 in the narrow sense is an elongated rectangle (the classic format of warehouse and transport pu-erh), while 方砖 is a square or near-square, usually small and thin, often with embossed characters on the face, imprinted directly in the pressing mold.
The practical meaning of the form comes down to three things:
- Surface-to-volume ratio. A thin square brick "breathes" differently from a thick cake: it has a larger share of edge material in contact with air and a smaller dense center, where aging proceeds slowest.
- Pressing density. Brick formats are traditionally pressed harder than cakes. This is transport geometry, designed for stacking. Hard pressing slows the exchange with air and makes aging slower and more even.
- Dosing. A square breaks into neat segments along pressing lines; small 方砖 formats are often conceived as "one brick, one session," without a pu-erh pick (茶刀).
History and Culture
History culture: Terroir and Raw Material
The material for 方砖 is Yunnan large-leaf tea, 云南大叶种 (yúnnán dàyè zhǒng), whose raw material after sun-drying yields 晒青毛茶 (shàiqīng máochá). This is the same semi-finished product that goes into cakes and nests; the difference between factory styles lies not so much in the form as in the blend and the school of fermentation.
For shu pu-erh, the source records an important point: fermentation carries a regional imprint, 味型 (wèixíng), a "taste type." A distinction is made between 勐海味 (měnghǎi wèi), 昆明味 (kūnmíng wèi), and 临沧味 (líncāng wèi). The imprint comes not only from the leaf but also from the factory itself: the water and the microflora of the workshops where 渥堆 has been carried out for years. For the brick segment this subject is especially tangible: the basic shu brick is historically Kunming, while the benchmark shu cake is Menghai, and the conversation about the "Menghai taste" revolves specifically around the latter.
Botany and Raw Material
Botany material: How to Read 唛号 on Bricks
Brick pu-erhs are the territory of factory recipes, designated by a four-digit code 唛号 (màihào). The reading scheme is simple and identical for all forms:
- digits [1–2]: the year the recipe was introduced;
- digit [3]: the grade of the raw material: the lower the number, the more tender the leaf;
- digit [4]: the factory: 1 for Kunming, 2 for Menghai, 3 for Xiaguan, 4 for Pu'er.
The key code for the brick format is 7581: a 1975 recipe, eighth-grade raw material, first (Kunming) factory, brand 中茶. This is the first shu brick and at the same time the benchmark of the entire brick segment. It is an inexpensive entry-level product against which the entire category of fermented pu-erh in brick form is still calibrated.
For comparison, the same year, a different form and factory: 7572 (1975, seventh grade, Menghai factory, 大益) is the benchmark shu cake and the most mass-produced shu pu-erh overall, the bearer of the "Menghai taste." Alongside it stand 8592 (1985, ninth grade, Menghai factory; one of the "老五样," known for the "紫天" batches, noticeably coarser raw material) and the modern 7262 (sixth grade, Menghai factory), a premium, more tender 大益 line.
The eighth grade in the 7581 code is not a flaw but a design decision: more mature, coarser leaf gives the brick structure and resistance to hard pressing.
Terroir
Terroir: Tenderness Grade Scale
For shu pu-erh there is a separate gradation by leaf tenderness: 宫廷 (gōngtíng, "palace") > 特级 (tèjí, supreme) > further numbered grades. 宫廷普洱 is the top tier: single buds and the most tender leaf that have undergone 渥堆. This is a premium segment, and it appears more often loose or in cakes than in brick formats.
The opposite pole is 老茶头 (lǎo chátóu), natural clumps that stick together in the fermentation pile due to pectins. This is neither a form nor a grade, but a by-product of 渥堆 with a sticky-sweet, dense texture (糯甜醇厚) and a collectible niche status. Knowing about it is also useful in relation to squares: 茶头 clearly demonstrates how much pectin "binding" affects the body of the infusion. The same mechanism partially works in a hard-pressed brick.
Production
Production: Technology: From 毛茶 to Brick
The scheme for the fermented (熟) version:
1. 晒青毛茶: fixation, rolling, sun-drying; the basic Yunnan semi-finished product. 2. 渥堆 (wòduī): wet pile fermentation with turning; this is where the 味型 of a specific factory is formed. 3. Blending according to 唛号: mixing grades of raw material in a set proportion. 4. 蒸压: steaming and pressing into a square mold; on 方砖 the relief is applied by the pressing mold. 5. Drying: slow reduction to warehouse moisture.
For the raw (生) version, step 2 is absent: 毛茶 is blended and pressed directly, while the transformations take place over years in storage.
Organoleptic Profile
Organoleptic: Nomenclature, Not a Separate Category
The square brick is an axis of form, and nothing more. The description of any pu-erh is composed of several independent axes: type (生 or 熟), form (loose 散茶, cake 饼, nest 沱, brick 砖), tenderness grade of the raw material (宫廷 / 特级 / numbered grades), factory recipe 唛号, regional fermentation imprint 味型. 方砖 changes only the geometry and density, and through them the speed of aging.
The reverse is also important: 唛号 is factory nomenclature of recipes, not state labeling. Four digits speak of the recipe year, raw material grade, and factory, but promise nothing about either the form or a specific batch.
Chemical Composition
Chemistry: Taste and Brewing
The profile depends on the type and tenderness of the raw material:
- 熟方砖 from mature raw material (the 7581 logic): dry wood, dark bread, date sweetness, clean minerality in the aftertaste.
- 熟方砖 from tender raw material (the 宫廷 logic): thicker and softer, chocolate-nutty tone, dense body, a short fermentation "cellar note" in the first infusions.
- 生方砖: in youth, a sharp bitterness with a quick 回甘; with age it moves into dried fruit and resinous wood; hard pressing stretches this path.
Practice: the brick is best broken apart along layers rather than chipped into chunks. This yields less dust and a more even extraction. For 熟: 8–9 g per 120–150 ml, full boiling water, a quick rinse of 5–10 seconds (for a very dense brick two short rinses are acceptable), then infusions of 5–8 seconds each, gradually lengthening. A dense square opens up later than a cake: do not increase the time in the first three infusions, otherwise the middle of the session will turn out over-extracted.
Health Notes
Health: History and Context of the Form
The brick is historically a transport and warehouse format: flat slabs stack without wasted space, which mattered for long-distance supply and state trade. The appearance of 7581 in 1975 made the brick also a technological milestone. It was the first shu brick, establishing that fermented pu-erh could be a mass standardized product.
Another story from the same decade shows how form worked for export: 销法沱 (xiāofǎ tuó) from the 下关 factory, "the nest sold to France," which went to the French market from 1976 and is associated with the importer 雷弗尔; it is also called the first Chinese tea "organic" export. The nest went to Europe, while the brick remained a domestic warehouse format. This is precisely why brick and square formats are more often found in a "factory" style, without export gloss.
Brewing
Brewing: How to Distinguish 方砖
- From 砖. 方砖 is a square or near-square slab, usually thin and small; the classic 砖 is an elongated rectangle, noticeably thicker and heavier.
- From 饼. A cake is round, with a concave depression on the back from pressing in a cloth bag; a square is pressed in a rigid mold and has no such "navel."
- From 沱. A nest is a hemisphere with a depression; confusion by silhouette is impossible.
- 生 or 熟. Dry shu leaf is dark brown to black, the infusion is opaque chestnut, the brewed leaf is uniformly dark and brittle. Sheng, even after aging, retains an olive-brown leaf palette and elasticity in the brewed leaf.
- Read the 唛号 if present. Four digits on the wrapper give the recipe year, raw material grade, and factory. The third digit immediately tells you whether to expect tenderness or structural coarseness.
- Assess the pressing. An even square with crisp edges is a machine mold; loose edges and uneven thickness are uncharacteristic for the square format and deserve questions.
Separately, it is worth remembering processed products: 柑普 / 小青柑 / 陈皮普洱 are shu pu-erh paired with Xinhui citrus peel (新会陈皮), an independent category with its own logic, unrelated to pressed squares.
