Oolong (烏龍, "black dragon") is a category of partially-oxidized teas from China and Taiwan. Where green tea is unoxidized and black tea is fully oxidized, oolong sits in the middle — anywhere from 8% to 80% oxidation, depending on the style. That single variable, plus a tradition of careful rolling and complex roasting, gives oolong the widest flavor range of any tea category. Some oolongs taste like sweet flowers and white peach. Others taste like baked stone, dark cocoa, and roasted nuts. They are technically the same kind of tea.
If green tea is dawn and black tea is midnight, oolong is everything in between.
What "partially oxidized" actually means
Tea oxidation is the slow chemical reaction that begins when the leaf is bruised — essentially the same browning that happens to a sliced apple. The leaf's enzymes encounter air; polyphenols change form; the leaf darkens; the flavor deepens. Different stopping points along this process give different teas.
- Unoxidized — green tea (steamed or pan-fired immediately after picking to denature the enzymes and stop the reaction).
- Slightly oxidized — white tea (allowed to wither and oxidize gently for hours; typically 5–15% oxidation).
- Partially oxidized — oolong (8–80%, depending on style).
- Fully oxidized — black tea (left until the leaf is uniformly dark; 100% in practice).
- Post-fermented — pu-erh (oxidized first, then aged with microbes; the only tea category with biological fermentation).
Oolong is unique in that the maker stops oxidation at a chosen percentage and then continues to shape the cup with rolling, drying, and sometimes roasting. The oolong producer's craft is in those choices.
The two great traditions
Oolong as a category is split between two principal regions, each with distinct styles:
Fujian, China
The original home of oolong. Two sub-regions matter: Anxi (in the south of Fujian) and Wuyi (in the north).
- Anxi oolongs are typically light-style — 15–30% oxidation, semi-rolled into tight balls, lightly roasted or unroasted. The most famous is Tieguanyin (鐵觀音, "iron goddess"), which our box features. The cup is jade-green, floral, with notes of orchid, lilac, and toasted nut.
- Wuyi oolongs ("rock teas," yancha) are dark-style — 50–80% oxidation, twisted long-leaf, heavily roasted over charcoal. The most famous is Da Hong Pao (大紅袍, "big red robe"). The cup is amber-dark, with notes of stone, baked plum, dark cocoa, and a famous "rock rhyme" mineral finish.
Taiwan
Brought by Fujian immigrants in the 1800s and developed into a tradition all its own. The Taiwanese moved oolong to higher elevations (1,000–2,500m), refined the rolling and oxidation techniques, and produced some of the world's most expressive oolongs.
- Light Taiwanese oolongs (Alishan, Lishan, Shan Lin Xi) — high-altitude, 10–25% oxidation, very floral and creamy. Often grown above 1,500m, with the cool nights producing exceptionally aromatic leaf.
- Medium-roasted Taiwanese oolongs (Dong Ding, Tieguanyin Taiwanese-style) — 20–30% oxidation with a charcoal roast added.
- Heavily-oxidized Taiwanese oolongs (Oriental Beauty / Bai Hao Wulong) — up to 70% oxidation, with a famous honeyed sweetness that comes from leafhopper insects partially eating the leaves on the bush before harvest.
What oolong tastes like
Generalizing across a category that spans 8% to 80% oxidation is difficult. But these flavor families recur:
- Floral — orchid, lilac, jasmine, gardenia. Common in light oolongs.
- Stone fruit — peach, apricot, nectarine, sometimes ripe plum.
- Cream and butter — found in some Taiwanese oolongs, particularly Jin Xuan ("milk oolong").
- Toasted and roasted notes — hazelnut, almond, baked bread, dark caramel. Common in roasted oolongs.
- Mineral and stone — wet rock, slate, the famous yan yun ("rock rhyme") of Wuyi oolongs.
- Cocoa and earth — found in heavily-oxidized, heavily-roasted oolongs.
A light Tieguanyin and a heavy Wuyi rock oolong share virtually no flavor descriptors. Yet they are both oolongs.
How to brew oolong
Oolong rewards a different brewing style from black or green teas. The traditional method is gongfu cha — small vessel, lots of leaf, many short steeps.
| Light oolong (Tieguanyin) | Dark oolong (Da Hong Pao) | |
|---|---|---|
| Water | 90°C / 194°F | 95°C / 203°F |
| Leaf | 5g per 100ml gaiwan | 5g per 100ml gaiwan |
| 1st steep | 40 sec (after 5-sec rinse) | 30 sec (after 10-sec rinse) |
| Subsequent steeps | +10–15 sec each | +10–20 sec each |
| Total pours | 5–7 | 6–10 |
If you do not have a gaiwan, a small teapot will work. The key principle is many short steeps from a generous amount of leaf, rather than one long steep — oolong's character unfolds over the course of the session.
Western-style brewing is also fine: 1 teaspoon per 8oz, 90°C / 194°F, 3 minutes for the first cup, 4 for the second. You will get fewer pours, and the cup will be closer to a single condensed expression rather than the gradual unfolding, but it is a perfectly legitimate way to drink oolong.
Caffeine
Oolong contains roughly 30–50 mg of caffeine per 8oz cup — between green tea and black tea. Light oolongs sit toward the green-tea end; heavily-oxidized oolongs sit toward the black-tea end. A single oolong session of multiple steeps will deliver more total caffeine than a single Western-style cup, simply because more leaf is involved.
Where to start
If you have never had a serious oolong, start with a light Anxi Tieguanyin (which our box features) or a Taiwanese Alishan. Both are floral, sweet, and forgiving in the cup. After two or three sessions, branch out — try a Da Hong Pao for the dark side of the category, or an Oriental Beauty for the bug-bitten honeyed style.
The single most useful thing you can do is taste a light oolong and a dark oolong side by side. Once you have, the entire category opens up.
FAQ
Is oolong tea green or black?
Neither — it is its own category. Oolong is partially oxidized, anywhere from 8% to 80%, which puts it between green tea (unoxidized) and black tea (fully oxidized). Some oolongs are closer to green; others closer to black; many are firmly in the middle.
Is oolong good for weight loss?
The research is mixed. Some studies suggest oolong may modestly increase metabolism, similarly to green tea, but the effect is small and unlikely to be transformative on its own. Drink oolong because the cup is interesting, not because of weight-loss claims.
How is Tieguanyin different from Da Hong Pao?
Tieguanyin (Anxi, southern Fujian) is light-style oolong — 15–30% oxidation, semi-rolled into tight balls, jade-green liquor, floral. Da Hong Pao (Wuyi, northern Fujian) is dark-style oolong — 50–80% oxidation, twisted long-leaf, heavily roasted, amber liquor, mineral and dark fruit. They are both technically oolongs but represent opposite ends of the category.
How long can I steep oolong?
For Western-style brewing, 3–4 minutes for the first cup. For gongfu-style, 30–40 seconds for the first pour, increasing by 10–15 seconds for each subsequent pour. Whole-leaf oolong can give 5–10 pours in a gongfu session — most of the cup's depth comes out in the second through fifth pours, not the first.
Should I add milk or sugar to oolong?
Most oolong drinkers — including us — would say no. The cup is built around floral or roasted complexity that milk obliterates. Sugar dampens both. Drink it straight; if you want a sweetener, a single drop of unflavored honey is the maximum we'd recommend.
Our Tieguanyin Oolong is a light-style Anxi from a single grower in Fujian — semi-rolled, partially oxidized, finished by hand. A good starting point.
