Black tea is tea that has been allowed to oxidise fully before it is dried, which is what turns the leaf dark and the liquor amber-red. It comes from the same plant as green tea, Camellia sinensis. The only real difference is that nobody stopped the oxidation. In China, where it was invented, it is not called black tea at all — it is called red tea, after the colour in the cup rather than the colour of the leaf.
Updated September 2026.
The short version
- Black tea = fully oxidised tea. Same plant as green, oolong and white. Different processing, nothing else.
- China calls it 红茶, red tea. The English name describes the dry leaf; the Chinese name describes the liquor.
- It was invented in the Wuyi mountains of Fujian in the 1600s. Every black tea on earth descends from that accident.
- Roughly 40–70 mg of caffeine per 8 oz cup — more than green tea, well under coffee.
- Bitter black tea is almost always over-steeped, not bad tea. Three minutes, then get the leaves out.
In this post
What black tea actually is
Every true tea — green, white, oolong, black, pu-erh — comes off the same shrub. What separates them is what happens in the few hours after the leaf is picked.
Pick a leaf and bruise it, and enzymes inside it start reacting with oxygen. The leaf darkens, the grassy notes fade, and malt, stone fruit and honey come forward. Green tea is heated early to stop that reaction almost immediately. Oolong is allowed to go part of the way. Black tea is allowed to go all the way, then dried once it is finished.
That is genuinely the whole difference. There is no separate black tea plant, no roasting step that defines it, no additive. Just a decision about when to apply heat. Which is why a fully oxidised oolong and a light black tea can taste closer to each other than either does to its own category average.
The history of black tea
Black tea is a newcomer. Green tea has been drunk in China for something like two thousand years of documented history, and the legends run much further back than that. Black tea shows up in the middle of the 17th century, in the Wuyi mountains of Fujian province.
The story told in Tongmu village, and it is a story rather than a document, is that soldiers passing through commandeered a tea factory for the night. The day's picked leaf sat unattended and oxidised far past where anyone intended. Rather than throw it out, the makers dried it fast over pinewood fires, and what came out was dark, smoky and sold anyway. That tea is Lapsang Souchong, and every black tea in the world descends from it.
Dutch and British traders took to it immediately, partly on taste and partly on logistics: fully oxidised tea survived a sea voyage in a way green tea did not. Demand outran what China would sell, so the British went looking in India, found the large-leaf Camellia sinensis var. assamica growing wild in Assam, and built an industry on it.
The result is that the large majority of tea sold in the United States and Britain today is black, and most people in those countries have never knowingly drunk anything else.
What does black tea taste like?
Deep is the word. Black tea tastes fuller and heavier than green or oolong because oxidation converts the fresh, grassy compounds into darker ones — malt, dried fruit, cocoa, honey, sometimes a wine-like sourness.
Beyond that it varies enormously by origin. Assam is malty and thick. Darjeeling is bright and almost floral. Dianhong is sweet and honeyed with no bite to it at all. Lapsang Souchong tastes like a campfire, which people either love or find undrinkable. What they share is body: black tea fills the mouth in a way lighter teas do not, and it is the only category that stands up to milk.
One honest note on strength. Strong is not the same as bitter. A well-made black tea can be extremely strong and still smooth. If yours is harsh, the fault is nearly always in the brewing, and the fix is in the brewing section below.
Types of black tea
Black tea is mainly cultivated in China and South Asia (India & Sri Lanka). You may have heard of some types of black tea before – Assam, Darjeeling, or Ceylon. But there are many types of black tea you may have never heard of!
Indian Black Tea
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Assam Tea
Assam tea is a special type of black tea coming from the Indian variant of Camellia sinensis var. assamica, which has larger leaves than the original Camellia sinensis plant. Assam tea tastes robust, full-bodied, and malty, perfect for making milky teas. -
Darjeeling Tea
Still from India, but coming from a different plant. Darjeeling tea is made from Camellia sinensis var. sinensis. It has a smooth and bright flavor, accompanied by muscatel and floral notes.
Sri Lankan Black Tea
Ceylon Tea
Still in South Asia, but moving a bit to the east. Ceylon tea originates from Sri Lanka, where it is grown in many parts of the country. The flavor can vary depending on the origin, but they generally taste light yet bold, crisp, often accompanied by floral notes.
Chinese Black Tea
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Lapsang Souchong Tea
Let's move north to China! Lapsang Souchong originates from the Wuyi region in Fujian province – this is the tea considered as the origin of all black teas. It is known for its smoky flavor, thanks to the pine needles used to smoke it. We wrote a whole post on why Lapsang Souchong is smoky, and when it isn't. -
Dianhong Tea (also known as Yunnan Red Tea)
The name says it – Dianhong tea or Yunnan red tea originates from Yunnan province, China. This tea is considered a high-end tea due to its “golden tips,” making it look more luxurious than its black tea counterparts. Dianhong tea or Yunnan red tea is made from the Chinese variant of Camellia sinensis var. assamica. This is the one we sell, and the one I grew up on — more in Chinese black tea isn't what you think. -
Keemun/Qimen Tea
Still from China, Keemun/Qimen tea originates from Anhui province. There are different types of Keemun tea, which creates a wide array of flavors – floral, fruity, smokey, malty. Despite the variety, this tea generally has a bright, wine-like color.
Kenyan Black Tea
Do you know that Kenya is among the largest tea producers in the world, alongside China and India, and the biggest exporter of black tea? Kenyan black tea generally tastes robust and full-bodied, yet spicy and citrusy.
All seven at a glance:
| Tea | Where it's from | Plant | Tastes like |
|---|---|---|---|
| Assam | Assam, India | assamica | Malty, thick, robust. Takes milk |
| Darjeeling | Darjeeling, India | sinensis | Bright, muscatel, floral |
| Ceylon | Sri Lanka | Both, varies by estate | Crisp, brisk, light but bold |
| Lapsang Souchong | Wuyi, Fujian, China | sinensis | Pine smoke, resin, campfire |
| Dianhong | Yunnan, China | assamica | Honey, malt, golden tips, no astringency |
| Keemun | Qimen, Anhui, China | sinensis | Wine-like, orchid, faintly smoky |
| Kenyan black | Kenya | Mostly assamica | Brisk, robust, spicy, citrusy |
Green vs. black tea: what are the differences?
Start with the similarity — both come from Camellia sinensis. Everything after that follows from one decision: whether the leaf is heated early to stop oxidation, or left to oxidise completely.
| Green tea | Black tea | |
|---|---|---|
| Oxidation | None — pan-fired or steamed right after withering | Full — rolled and left in open air |
| Dry leaf | Green, sometimes silvery | Dark brown to near-black |
| In the cup | Pale yellow-green | Amber to deep red |
| Flavour | Grassy, vegetal, sweet, delicate | Malty, bold, deep |
| Water temperature | 75–85°C / 170–185°F | 90–100°C / 195–212°F |
| Typical caffeine (8 oz) | 25–45 mg | 40–70 mg |
| Chinese name | 绿茶 — green tea | 红茶 — red tea |
If you want the green side in full, we have a complete guide to green tea covering the same ground from the other direction.
The caffeine content of black tea
Black tea sits at the higher end of the tea range and well below coffee. These are commonly cited ranges rather than fixed values — the actual number in your cup depends on leaf grade, how much you used, water temperature and how long you steeped it, and those variables move it further than the tea type does.
| Drink (8 oz / 240 ml) | Commonly cited caffeine |
|---|---|
| Brewed coffee | 95–165 mg |
| Black tea | 40–70 mg |
| Oolong tea | 30–50 mg |
| Green tea | 25–45 mg |
| White tea | 15–30 mg |
| Decaffeinated black tea | 2–5 mg |
For a reference table outside the tea trade, the Mayo Clinic's caffeine chart is the one I point people at. Practically: a cup of black tea in the afternoon will keep some people up, and if that is you, drink it before three.
Is black tea good for you?
This page used to carry a list of eight health benefits — cancer risk, blood pressure, diabetes, gut health, blood sugar, heart health. I have taken that list down. It was written in 2021, it was far more confident than the evidence supports, and a tea shop is not the right source for claims about disease. If you read it here and believed it, I am sorry.
What can be said honestly is short:
- Black tea contains caffeine, roughly 40–70 mg a cup. It wakes you up. That part is not in dispute.
- It contains L-theanine, an amino acid found in tea leaves, which is what people usually point to when they say tea's caffeine feels different from coffee's.
- Unsweetened, it has essentially no calories, and people have drunk it daily for four hundred years.
- If you are pregnant, taking medication, or watching your caffeine, that is a conversation for a doctor, not for me.
Beyond that, drink it because it tastes good. That has always been the real reason anyone drinks tea, and it does not need propping up.
The best way to brew black tea
Two methods, and neither is more correct than the other. It depends how much time you have.
| Method | Leaf | Water | Temperature | Steep |
|---|---|---|---|---|
| Cup method | 2 g (about 2 tsp) | 250 ml / 8.8 oz | 100°C / 210°F | 3–5 minutes, once |
| Gaiwan method | 4 g | 120 ml / 4 oz | 100°C / 210°F | 15s, 25s, 40s, 60s, 80s, 100s |
Cup method. Preheat the cup with hot water and tip it out. Add the leaf, pour on water just off the boil, and steep three to five minutes. Then — and this is the part people skip — get the leaves out. Tea left sitting on its leaves keeps extracting, and past about five minutes what it extracts is tannin. That is your bitterness, and it is not the tea's fault.
Gaiwan method. More leaf, less water, short steeps poured off fast. Preheat the gaiwan, add 4 g, pour hot water in and straight back out again to wake the leaves up (pour that rinse into your cup to warm it). Then steep for fifteen seconds and serve into a small cup — don't drink from the gaiwan itself. Six steeps is normal, each a little longer than the last: 15s, 25s, 40s, 60s, 80s, 100s. You get a different tea each round, which is the entire point.
If you want the broader version of this covering every tea type, it is in how to brew loose leaf tea.
Where to buy black tea
Whoever you buy from, check three things: that the origin is specific (a region, not "China"), that there is a harvest date or season on the packet, and that someone has tested the leaf. Vague origin is the tell. A seller who knows their tea knows where it came from.
My own family is from Yunnan, which is where black tea's raw material — the big-leaf assamica plant — grows best, and I buy our Dianhong from Feng Qing directly rather than through a broker. It is the tea I drink most mornings. Golden tips through the dry leaf, a brassy orange liquor, a gentle earthy aroma, and almost no astringency: sweet and thin and somehow deep at the same time. Every batch is screened by an independent lab for pesticides and heavy metals before it ships.
Have a look at our Dianhong black tea if you want to start where I started.
FAQ
What is black tea?
Black tea is tea from the Camellia sinensis plant that has been left to oxidise fully before drying, which darkens the leaf and turns the brewed liquor amber-red. It is the same plant as green tea; only the processing differs. In China it is called red tea.
Is black tea stronger than green tea?
In flavour, yes — full oxidation produces malty, deeper notes with more body. In caffeine the gap is smaller than people expect: roughly 40–70 mg per cup for black against 25–45 mg for green, and how you brew it matters more than which you chose.
How much caffeine is in a cup of black tea?
Commonly cited figures put an 8 oz cup at 40 to 70 mg, against 95 to 165 mg for brewed coffee. More leaf, hotter water and a longer steep all push it up, so the same tea can land anywhere in that range depending on how you make it.
What is the difference between black tea and red tea?
Usually none — what English calls black tea, Chinese calls red tea (红茶), naming it after the liquor rather than the leaf. Confusingly, "red tea" in some countries means rooibos, a South African plant that is not tea at all and has no caffeine.
Why does my black tea taste bitter?
Almost always over-steeping. Past about five minutes the leaf gives up tannins that taste harsh and drying. Take the leaves out on time, use slightly less leaf, and if you are brewing a delicate Chinese black tea, let the water sit for a minute off the boil.