a record, not a promise
In 2004, a single pressing of Lǎo Bānzhāng (老班章) shēng pǔ’ěr (生普洱) — just 420 cakes — was wrapped in unbleached mulberry paper, its surface rough as dried leaves, and divided into four identical lots. One stayed in a Kunming apartment, where the dry highland air moved slowly through half-open windows, leaving the cakes light and firm. Another went to a ground-floor warehouse in Guangzhou, whose humidity softened the leaves and darkened the wrapper within eighteen months, giving the tea a warm, damp-wool scent. A third crossed the strait to a brick-lined storehouse in Taichung, the hottest and dampest of all, where the cakes took on a deep, almost fermented earth note. The last lot settled into a purpose-built cellar in Kuala Lumpur, cooled by a slow air-conditioner that hummed through monsoon seasons, stealing away the tropical sweat but leaving a faint mildewed sweetness.
Each cake carried the same day’s steam and stone-press weight, but from that moment they began diverging into four distinct teas. The Bulang aging curve study began as a set of notebooks kept by a tea.community member who owned all four lots — at first only notes on broth colour and the persistence of the huí gān (回甘). Over twenty years, quarterly blind tastings, laboratory extractions, and meticulous auction price tracking transformed those notebooks into the most detailed public record of how a single shēng pǔ’ěr ages under distinct cāng (仓) conditions.
Master Fang Ting, who has overseen the blind evaluations since 2010, compares the tea from Kunming to a letter written in dry ink — the liquor pale gold, the aroma high and quiet — while the Guangzhou sample tastes of damp earth and old library paste, its colour a thick amber. The Taichung cake, when steeped, yields a dark broth that coats the tongue with a smooth, almost syrupy weight. The Kuala Lumpur sample remains the most surprising: a light camphor note rises through the steam, stubbornly holding against twenty years of warmth.
The study does not offer any investment forecast. Price data — collected from auction archives and private sale records accessible via puerh.app — is presented as context, never as projection. What the curve shows is that value often moved with fashion as much as with leaf. The dry-stored Kunming cake, for instance, saw a sharp price rise during a period when collectors favoured ‘pure storage’ character, while the Guangzhou lot lagged; later, that relationship reversed.
For those wishing to go deeper, the library at tea.school holds controlled-storage trials and sensory analysis guides. The raw dataset, updated every Q4, can be explored interactively at puerh.app, where enthusiasts register personal cakes for parallel tracking.
The Bulang aging curve does not answer ‘which storage is best.’ It asks a quieter question: what happens when we pay attention for twenty years? The answer is in the data — and in the cup, which, for those who reserve a window, still holds the faint camphor echo of the 2004 harvest and the crisp snap of a well-kept cake edge under the fingernail.
What changes
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Access to the full dataset updated quarterly, with annotated seasonal notes from master Fang Ting.
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Invitation-only vertical tastings of the same pressing at different storage intervals, held at tea.events.
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A private channel on tea.community with the research team for questions and discussion.
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Early access to the annual aging curve report before public release.
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Priority booking for physical archive visits in Kunming, where the core samples are held.
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Option to register a personal cake for parallel tracking in the study’s database.