Classification and Origin
Classification origin: Why compressed tea needs paper
Puerh (普洱茶, pǔ'ěrchá) is almost always compressed. Historically this was how it was transported along the 茶马古道 (chámǎ gǔdào), and it is also how it stores and ages most conveniently. The standard form is the 七子饼 (qīzǐbǐng), a 357 g cake, seven cakes in a stack (historically 2.5 kg). There are also 砖 (zhuān, brick), 沱 (tuó, bowl/nest), 金瓜/团 (jīnguā/tuán, melon/tuo), 龙珠 (lóngzhū, pearl), and loose 散茶 (sǎnchá).
Compressed tea is anonymous: a pressed leaf from one factory is barely distinguishable in appearance from another, and grade and recipe can only be approximately judged from the surface. Hence the multi-layered marking system: the longer tea lives and the more valuable it becomes, the more important it is that its "biography" survives together with it.
History and Culture
History culture: Three tickets: 内飞, 内票, 大票
| Element | Where it is located | Can it be removed and replaced | What it usually states | |---|---|---|---| | 内飞 (nèifēi) | pressed into the body of the tea during steam compression | no, not without intervention into the cake surface | producer, trademark, sometimes recipe/series | | 内票 (nèipiào) | lies under the wrapper, outside the tea | yes, freely | tea description, region, factory, sometimes security marks | | 大票 (dàpiào) | on the crate/stack, outside everything | yes, freely | batch, quantity, date, shipping mark |
The logic is simple: reliability decreases with distance from the tea leaf.
内飞 — the slip inside the tea
内飞 is a rectangular or square slip of thin paper placed on the raw material before steam compression (蒸压, zhēngyā, regulated by standard GB/T 24615 on compressed tea production). After pressing, part of the leaf becomes pressed down by tea leaves, the edges go under the leaf, and the slip becomes part of the cake body. Usually the 内飞 is on the front side, closer to the center, sometimes on the back.
The key property: 内飞 cannot be neatly removed and reattached. It is not glued on, it is fused into the structure of the compressed leaf. To replace the slip, one would have to either disturb the surface of the cake (leaving visible traces: a loosened spot, protruding fragments, a mismatch in relief), or steam and re-press the entire tea, and re-pressing changes density, surface pattern, and is usually noticeable
Botany and Raw Material
Botany material: 棉纸 — wrapper paper
棉纸 (miánzhǐ) is the general name for the thin fibrous paper in which a cake is wrapped. It is called both "rice paper" and "cotton paper"; in practice it is thin plant-fiber paper, handmade or machine-made, with fibers visible against the light. Such paper breathes: it is not hermetic, it lets air through and allows the tea to continue the slow post-fermentation underlying the principle 越陈越香 (yuè chén yuè xiāng), "the longer it rests, the more fragrant it becomes."
The wrapper carries the essentials: the producer's name and mark, product name, weight (usually 357 g for a cake), type as 生茶 (shēngchá) or 熟茶 (shúchá), region, and often the 唛号 (màihào), the four-digit recipe code of the large factories, introduced in 1976. In it, the first two digits are the year the recipe was approved, the third is the raw material grade (the lower, the more tender), the fourth is the factory: 1 — 昆明 (Kūnmíng) / 中茶 (Zhōngchá), 2 — 勐海 (Měnghǎi) / 大益 (Dàyì), 3 — 下关 (Xiàguān), 4 — 普洱 (Pǔ'ěr). Thus 7542 means a 1975 recipe, grade 4 raw material, Menghai. It should be stressed separately: 唛号 is a recipe, not a production year and not a storage characteristic. A 7542 cake can be pressed in any year.
For tea of the 印级茶 (yìnjíchá) era, 1950s–70s, the very color of the 中 mark printed on the wrapper gave names to entire lines: 红印 (hóngyìn), 绿印 (lǜyìn), 黄印 (huángyìn). In other words, the wrapper typography here is not a decorative detail but part of
Terroir
Terroir: 笋壳 — bamboo husk
A stack of cakes, usually seven pieces, 一筒 (yī tǒng) or 一提 (yī tí), is traditionally tied in 笋壳 (sǔnké), the sheath of a bamboo shoot, bound with bamboo tape or twine. The stacks are then placed into a crate or basket (件, jiàn); the number of stacks in a shipping unit depends on the producer and period, and there is no single universal standard here.
Bamboo husk is primarily a packaging material: stiff, breathable, protecting cakes from mechanical damage and direct contact with moisture, but not insulating them. In established storage practice it is considered that tea in 笋壳 ages more evenly, since the stack represents a more inert volume. Bamboo also has its own smell, which partially transfers to the outer cakes of the stack; how much this affects taste depends on the material and warehouse conditions, and no quantitative assessments exist here.
As an attribution element, 笋壳 hardly works: the box and husk are easily replaced, old shells are reused, and markings on them are often applied by hand.
Production
Production: What is easy to counterfeit and what is hard
In increasing order of falsification difficulty:
1. 大票 and 笋壳. A separate sheet and a shell, not tied to the tea. They are manufactured and substituted without traces. 2. 内票. A loose insert. Substituted just as easily; modern security codes complicate the task but can only be verified with the producer. 3. 棉纸 wrappers. Harder: one must reproduce the paper, print, character design, and aging pattern. They do reproduce it, and well. A separate problem is genuine old wrappers removed from one tea and put onto another. 4. 内飞. The hardest to convincingly imitate on old tea: the slip must be fused into the surface, aged together with the cake, with the same pattern of stains and darkening as the adjacent leaf, and its edges must go under the tea leaves without signs of intervention. A fresh insertion, an even one, an undusted edge, a mismatch in aging between the 内飞 paper and the wrapper, a loosened area around it, these are warning signs.
But this hierarchy has a ceiling. No paper proves that the tea inside is that tea. A scenario well known among collectors is authentic packaging with all tickets on someone else's tea or on tea with adulteration; with re-pressing, the "relocation" of 内飞 is also possible. Therefore paper is one argument alongside the state of compression, the character of the leaf, the aroma of the dry tea and, above all, the taste across infusions. Paper narrows the circle of hypotheses, it does
Organoleptic Profile
Organoleptic: Why the absence of 内飞 is not a verdict
For old tea, the absence of 内飞 by itself decides nothing, and here is why.
- Practice varied. The presence of 内飞 was not a universal and constant attribute: different producers and different periods treated internal tickets differently, and we do not give here a full chronology of who inserted 内飞 obligatorily and when, since it is not a commonly known firm quantity.
- The slip is physically lost. 内飞 sits in the surface layer. When tea is broken off with a knife (撬茶, qiàochá), when it is moved and transported, the area with the slip easily comes off together with the broken piece.
- Wrappers were replaced. Paper in warehouses gets damp, tears, and is eaten by insects. Rewrapping old tea in new paper is ordinary reality, especially after the era of humid storage 湿仓 (shīcāng) and Hong Kong warehouses; in the process 内票 and 大票 disappear, and the 内飞 itself may be damaged.
- Naked cakes. Some tea was long stored and sold without any wrapper at all, as loose stacks or individual cakes, and was also broken into loose tea for retail.
- Export and re-marking. Batches were repackaged for a specific recipient, and the external marking did not have to match the original in that case.
The reverse is also true: a full set of paper, 内飞, 内票, 大票, husk, a neat stack, is not proof either. A full set costs more precisely because it raises market price, which means there is economic sense in manufacturing it.
Practical conclusi
Chemical Composition
Chemistry: How to inspect the paper layer without destroying the tea
A calm order of actions, without bias:
- Unfold the wrapper fully, without tearing the folds, and see whether 内票 is under it and where it was inserted.
- Compare the data on the wrapper and 内票 with each other: tea type, weight, region, 唛号, producer. Discrepancies are not a verdict but a reason to ask the seller a question.
- Find the 内飞 on the front and back. Assess whether its edges go under the tea leaf, whether the degree of yellowing and soiling of the slip matches the general state of the cake, whether there are traces of glue, fresh folds, or a loosened area around it.
- Compare the state of the paper with the declared age and storage type: dry storage 干仓 (gāncāng) gives slow even yellowing, humid storage gives more pronounced stains, deformation, and a warehouse smell on the paper itself.
- If 大票 is present, copy the batch number and all dates indicated; this is the only place where a release date may be stated directly.
- Do not draw a conclusion about authenticity from paper alone. Brew.
Health Notes
Health: What this article does not assert
- It does not provide the years when paper types, fonts, printing methods, and 内飞 formats changed at specific factories. Such chronologies exist among specialists, but there is no single publicly available and indisputable compendium of them, and we do not reproduce them from memory.
- It does not state the exact number of stacks in a shipping unit as a universal norm: it depends on the producer and period.
- It does not describe the current security marks of specific brands: they change, and their verification is possible only through the producer.
- It does not assert that 内飞 proves authenticity. It proves only that the marking entered the tea at the pressing stage; the print may be copied, and the tea may be substituted during re-pressing.
- It does not assert the opposite, that paper is useless. It carries the only available non-destructive information about recipe, weight, type, and sometimes date.
- The influence of bamboo husk 笋壳 on the taste of a stack is described qualitatively; there are no quantitative data on the size of this influence here.
- Attribution of tea from the 号级茶 and 印级茶 eras by paper signs is work for experts with reference samples. This article explains the structure of the system but does not replace expert examination and does not provide criteria by which one can independently confirm the authenticity of an antique batch.
