Quick Answer
Tea bitterness comes mainly from caffeine, with catechins contributing; astringency comes from catechins binding to saliva proteins. Hotter water, longer steeping and more leaves extract more of both. Shops keep tea consistent by fixing the leaf-to-water ratio, temperature and time and straining immediately. Bitter lemon tea usually comes from lemon peel soaking too long.
Where bitterness comes from
| Taste | Main source | When it shows up |
|---|---|---|
| Bitter | Caffeine, catechins | Hot, long steeping or too many leaves |
| Astringent | Catechins (especially galloyl catechins) | Bud-rich teas, green tea brewed hot |
| Citrus bitter | Naringin and limonin in peel | Lemon slices or kumquat soaking with peel |
Water temperature and time
- Green tea: young leaves are rich in catechins; use cooler water and avoid long boiling steeps.
- Oolong: near-boiling water, shorter time.
- Black tea: hot water, strain on time.
- Cold brew: less bitter, but very long steeps still turn astringent; see how to cold brew tea.
Troubleshooting
| Problem | Likely cause | Fix |
|---|---|---|
| Tea tastes different every day | Ratio, temperature or time not fixed | Write an SOP, use timers and scales |
| Turns bitter after holding | Leaves not fully strained, holding too hot | Strain right away, limit holding time |
| Bitter lemon green tea | Lemon slices or squeezed peel | Use lemon juice or syrup, add slices last |
| Astringent cold brew | Too long or too many leaves | Shorten fridge extraction, adjust ratio |
For consistent cups, consider a tea espresso machine with fixed pressure and time. For holding times see how long brewed tea lasts.
How Tang Sugar can help
Tang Sugar supplies bubble tea tea leaves and tea espresso machines, with suggested brewing parameters to help shops standardize tea.
Products in this article
All 13 Tea Leaves →
FAQ
Why does tea taste bitter?
Mainly caffeine and catechins; hot water, long steeping and too many leaves increase bitterness.
Why does tea feel astringent?
Catechins bind to saliva proteins; bud-rich teas and green tea show it more.
Why is my lemon tea bitter?
Lemon peel contains naringin and other bitter compounds; squeezed peel or long-soaking slices make it bitter.
How can I save tea that is too bitter?
Dilute it or turn it into milk tea or fruit tea; shops should fix the ratio and time instead.
Related Reading
How to Make Cold Brew Tea: The 1:50 Tea-to-Water Ratio, Steeping Time and Shop Uses
How to Make Lemon Green Tea: Dosage for 500ml and 700ml Cups and How to Avoid Bitterness
What Is a Tea Extraction Machine? Freshly Extracted vs Batch-Brewed Tea and Choosing Extraction BagsAlso see: Tea leaves (products)
