Est. 1956 · The Order The independent guide to oolong: the partly oxidized teas, and how to brew them. Oolong.biz
THE ORDER OF THE SEVENTH STEEP SEMPER PARTIM OXIDATUM The Order of the Seventh Steep
The Order of the Seventh Steep
OOLONG
Semper Partim Oxidatum Always partly oxidized

Tagged: oolong

Article · varieties

Honey Orchid to Duck Shit, and Whether the Names Are Real

These Chinese oolongs, the Phoenix Dancong family, are named for a smell, not a place, and nothing is added to the leaf. Gas chromatography has now checked whether a bush named for one scent really carries different chemistry from the next. Mostly it does, but the lab draws fewer lines than the menu.

Jul 2, 2026
Article · Basics

Why one plant makes green, oolong, and black tea

Green, oolong, and black tea are the same leaf from Camellia sinensis. What separates them is processing, above all how much enzymatic oxidation the maker allows before heat arrests it.

Jul 1, 2026
Article · Regions & Origin

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.

Jun 24, 2026
Article · Health & Science

The oolong weight-loss trials measured hours of fat-burning, not pounds

No systematic review of oolong and weight loss exists, only two small human trials. Here is what those trials, and the closest systematic review that does exist (green tea's), actually measured, in kilograms, not adjectives.

Jun 17, 2026
Article · Health & Science

Why a Green Oolong and a Heavy Roast Never Want the Same Water

The brewing guide states the temperature bands by oxidation level. Here is the extraction chemistry, measured in real studies, that makes them true.

Jun 4, 2026
Article · Brewing & Gongfu

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.

May 21, 2026
Article · Health & Science

The Oolong Diabetes Trial Everyone Cites Had One Funder

A 2003 trial found oolong tea cut blood sugar by nearly a third in diabetic patients. It was run by a beverage maker's own research lab, the one independent repeat found nothing, and a large cohort found the opposite. Here is what actually holds up.

Apr 10, 2026
Article · Brewing & Gongfu

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.

Mar 27, 2026
Article · science

In One Taiwanese Tea, the Bite Mark Is the Flavor

Oriental Beauty oolong is made only from tea leaves a small leafhopper has already bitten. The plant's response to that bite is now mapped to a single gene switch, and it is not the same chemistry a shaken, unbitten leaf ever produces.

Mar 20, 2026
Article · science

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.

Feb 23, 2026
Guide · Brewing & Gongfu

Oolong Brewing

The standing method for brewing oolong, gongfu and Western, with sourced temperatures, gram ratios, steep times, and infusion counts, and how greener and roasted leaf want different heat.

Guide · Basics

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.