You brew a cup of tea, pour the liquor, and discover it's murky and unclear. Or perhaps it tastes burnt, stuffy, or carries a strange sour note. These are all warning signs that something is wrong with your tea. When tea liquor emerges from the pot, its color immediately reveals whether you've chosen well. Clarity is fundamental—even the deepest-colored liquor should be transparent. If you notice your tea liquor is cloudy, the tea has problems, and there's no saving it.
Clear Liquor Is Basic: Cloudiness Means Trouble
Tea makers fear producing flawed tea, and when tea liquor shows abnormal characteristics, it usually indicates errors during processing. Tea quality evaluator Chen Feng-cheng has identified sixteen types of "off" flavors (不對味 / bù duì wèi) that help us quickly recognize quality problems.
These sixteen categories cover potential issues from manufacturing through storage. Understanding what causes these problems not only helps you select better tea, but also teaches you how to store tea properly. Let's examine each common tea defect.
Processing Problems (Types 1-5)
1. Burnt Flavor (焦味 / jiāo wèi)
Possible causes: Kill-green (殺菁 / shā qīng) temperature too high, scorching fresh leaves and creating a burnt taste; improper coordination between leaf quantity and drum rotation speed; excessive moisture content causing uneven tumbling and localized scorching; poor handling during initial drying or roasting, producing an overpowering roasted flavor.
2. Weak/Thin Flavor (味淡 / wèi dàn)
Possible causes: Coarse, old tea leaves with aged leaf material; excessive resting time causing over-oxidation; over-killing during kill-green with too much moisture loss; insufficient rolling preventing proper extraction; tea juice lost during rolling; prolonged kill-green and baking; excessive sun withering.
3. Raw/Grassy Flavor (菁味 / qīng wèi)
Main causes: Kill-green performed too early; insufficient kill-green time; short resting period failing to eliminate raw grassiness.
4. Stuffy/Stewed Flavor (悶味 / mèn wèi)
Causes: Leaves not cooled promptly after rolling; improper thick-pile handling during various processing stages; poor handling during ball-rolling, left sitting too long; drying temperature too low combined with overly thick piles and extended time.
5. Bitter/Astringent Flavor (苦澀味 / kǔ sè wèi)
Causes: Harvesting during rain; insufficient withering; kill-green performed too early or too briefly; static oxidation too short; over-rolling causing excessive cell damage.
Environment and Raw Material Problems (Types 6-10)
6. Sour Flavor (酸味 / suān wèi)
Causes: Hot, humid weather during processing; leaves not spread thinly enough after sun withering; excessive pile thickness during indoor withering; improper storage in high humidity without sealed packaging.
7. Smoke Flavor (煙味 / yān wèi)
Causes: Smoke contamination during kill-green or drying from fuel combustion; smoke absorption during drying if heat source isn't properly isolated.
8. Musty Flavor (霉味 / méi wèi)
Causes: Improper storage in damp conditions; insufficient drying before storage; damaged packaging allowing moisture penetration.
9. Strange/Foreign Flavors (異味 / yì wèi)
Causes: Processing equipment contamination; storage near strong-smelling substances; packaging materials with odors; tea absorbing ambient smells.
10. Aged/Stale Flavor (陳味 / chén wèi)
Causes: Extended storage beyond optimal freshness; oxidation due to air exposure; breakdown of aromatic compounds over time.
Storage and Handling Problems (Types 11-16)
11. Sun Deterioration (日曬味 / rì shài wèi)
Causes: Tea exposed to sunlight after processing; storage in locations with direct sun exposure.
12. Water Absorption Flavor (受潮味 / shòu cháo wèi)
Causes: Inadequate moisture-proof packaging; storage in humid environments; container opened frequently in humid conditions.
13. Mixed Harvest Flavor (雜味 / zá wèi)
Causes: Mixing leaves from different harvests or cultivars inappropriately; inconsistent processing of mixed materials.
14. Incomplete Fermentation (發酵不足 / fā jiào bù zú)
Causes: Processing ended prematurely; insufficient oxidation time; temperature too low during withering and oxidation.
15. Over-fermentation (發酵過度 / fā jiào guò dù)
Causes: Oxidation continued too long; temperature too high during withering; delayed kill-green.
16. Flat/Dead Flavor (死味 / sǐ wèi)
Causes: Multiple processing errors compounding; severely improper storage; tea well past its prime.
What to Do When You Encounter Off Flavors
If you detect any of these defects, the honest answer is: move on. Unlike wine that might improve with time, most tea defects cannot be corrected. A burnt, musty, or sour tea won't transform into something pleasant regardless of brewing technique.
Use this knowledge when shopping: ask to taste before buying, and trust your senses. Good tea should taste clean, clear, and pleasant from the first sip. Any of these sixteen warning signs suggests you should look elsewhere.
[INTERNAL LINK: How to evaluate tea quality like a professional]
