Tagged: tieguanyin
The 98 Percent Tea Statistic Nobody Checked
Anxi's 2012 pesticide scandal is still summed up in one repeated number. It was never a measurement of the county's tea, and the county's own reduction figures, checked against independent fieldwork, tell a more specific story.
The Old Rule About Spring and Autumn Tea, Tested Against 266 Cups
Anxi trade wisdom credits spring Tieguanyin with the fuller cup and autumn with the better scent. A 2025 study of 266 finished teas checked the chemistry, and found the saying right about direction and nearly silent about how much a buyer should let it decide.
DNA Testing Keeps Finding Tieguanyin's Own Cousin in the Bag
Genetic and spectral tests on commercial Tieguanyin keep turning up a different, related Anxi cultivar blended in, most often Benshan, close enough in leaf and aroma to pass for its more famous cousin.
Both Tieguanyin origin legends fail the record; a cutting explains the tea
Tieguanyin carries two competing origin stories, a farmer's dream and a scholar's gift to an emperor. Chinese tea scholarship itself has already ruled on which one holds up, and the real, documented history is stranger than either.
A charcoal roast is a sequence of fires, rested months apart
Charcoal roasting is a sequence of separate fires, not one step, and each fire does distinct, measurable chemistry to the leaf. The practice also varies more across oolong styles than most tea copy admits.
What Mineral-Heavy Water Does to Oolong: Less Catechin, a Cloudier Cup
A 2024 study brewed the same Tieguanyin in four different waters and measured what came out. Mineral content moved the chemistry, not just the story a taster tells about it.
The Pot Is Not Neutral: What Six Teapot Materials Do to the Same Oolong
Researchers brewed one oolong in six vessels, zisha and zhuni clay, stainless steel, ceramic, glass, and plastic, then measured what actually left the leaf. Clay changed the chemistry. Here is what the pore structure explains.
China Deleted Its 26-Year Rare-Earth Standard for Tea
In 2012, Anxi farmers were caught spraying rare-earth fertilizer to force faster growth on cheap tea. In 2017, China deleted the food-safety standard that had caught them, after concluding tea itself carries the element naturally, oolong more than any other kind.
Same Leaf, Split Into Green and Black, Kept Almost the Same Caffeine
Catechins collapsed by more than ninety percent between the two halves. Caffeine barely moved. Oxidation, the reaction that defines oolong, is not what decides how much of it ends up in the leaf.
Oolong and Geographical Indication
A protected name is not a quality grade. What geographical-indication protection actually certifies for Wuyi yancha, Anxi Tieguanyin, and Phoenix Dancong, why Taiwan's oolongs sit outside that system entirely, and why an American shop can sell fake "Tieguanyin" legally, not because no protection exists, but because none of the four names has ever filed for the one the US offers.
Oolong Grades and Cultivars
Oolong carries four different things called a grade: a national sensory tier, a government cultivar registration, a trade aroma-type name, and a competition award. The canonical account of what each one actually certifies, and what it does not.
Kill-Green
The heat step that arrests enzymatic oxidation in oolong. What denatures the enzymes and why it cannot be undone, the wok and the drum with their real numbers, how a maker judges it done, the two ways it fails, and the storage defect that only resembles one.
Oolong Oxidation and Roast
The two axes that define an oolong. What enzymatic oxidation is and how it is arrested by kill-green, why oolong sits partly oxidized between green and black, and how roasting is a separate step applied afterward.
Oolong Regions and Origins
The canonical geography of oolong across its four classic origins: the Wuyi cliffs and Anxi in Fujian, the Phoenix mountains of Guangdong, and the high mountains of Taiwan, with the terroir, cultivars, and elevations that separate them.
What Is Oolong Tea
Oolong is partly oxidized Camellia sinensis, made to a chosen point between green and black. This is the canonical account of what it is, how it is made, the major style families, how it tastes across the spectrum, and why it is brewed gongfu.