Musty
The smell of a tea stored damp — distinct from the earthy character of a properly aged one, and the distinction is not academic.
Musty is what a cake smells like when it has been kept somewhere too humid and unventilated: a stale, closed, cardboard-and-cellar smell that does not clear with airing and does not improve with time. It is routinely confused with the earthy, forest-floor character of a well-aged sheng or a good shou, and vendors sometimes trade on the confusion, describing a damaged tea as merely traditionally stored. The useful test is whether the note is integrated and clean or stale and separate, and whether it lifts across successive infusions or persists. Storage vocabulary distinguishes wet storage from dry storage, and the argument about where the line falls is genuinely unresolved within the tradition — but a tea with visible mould or a smell that does not clear is not on either side of that argument, it is spoiled. TeaHQ does not state a tolerability position here; that is a safety question and the safety layer is held under review.
Which sense this is
Aroma. Volatile compounds, smelled through the nose or retronasally while drinking. Nearly all descriptive tea vocabulary is here, including words people say they can taste.
Compound descriptor. A familiar thing used as shorthand for a mixture of sensations. Nobody detects 'chestnut' — they recognise it.
Where it comes from
- Processing step
Storage that is too humid and not ventilated. Warehouse practice for pu-erh includes deliberate airing cycles precisely because sealed damp storage produces this.
A named production step reliably produces it. A statement about practice, not about chemistry.
Processing: processing-warehouse-cycle, process-ageing. Types: type-dark-tea.
- Processing step
A wet-piling batch that was not dried down properly after fermentation can carry it from the start rather than acquiring it in storage.
A named production step reliably produces it. A statement about practice, not about chemistry.
Processing: process-wet-piling. Types: type-dark-tea.
When it is a fault, and when it is not
A fault wherever it appears. The earthy, damp-forest character of a correctly aged dark tea is a different note with its own record, and the two are told apart by whether the smell is clean and integrated or stale and separate.
Not to be confused with
- Earth (Aroma) — Damp forest floor and mushroom — the correct character of shou pu-erh and aged sheng, and the one most often confused with a storage fault.
What gets said that is not right
That mustiness is simply what aged tea smells like. Well-aged tea smells of damp earth and old wood and is clean; musty tea smells stale and closed and does not clear.
Nearby
A tasting note is a comparison, not a measurement. Where the route from leaf to sensation is established it is labelled as such above; where it is not, the page says so rather than supplying a mechanism the descriptor has not earned. See the rest of the vocabulary for how the axes divide up.