The Flavour Wheel & the Six Teas' Character

When we call a tea “good,” we are judging three things at once: taste on the tongue (bitter, umami, sweet), aroma perceived through the nose (floral, fruity, roasted…), and mouthfeel (astringency, body, smoothness). Molecular composition is the foundation, but flavour usually arises from many compounds, concentrations and perceptual interactions—not a one-note-to-one-molecule match[1][3].

The interactive flavour wheel below sorts common tea descriptors into eight families. Pick a tea and the wheel highlights an editorial selection of typical descriptors; hover any segment to see representative compounds or formation pathways associated with it:

Switch between green, oolong, black and dark tea and you’ll see it directly: green tea concentrates in green, umami and bitter-astringent notes; oolong fans out into floral and fruity; black tea shifts to sweet-floral and body; dark tea settles into woody-aged and mellow. This is the flavour projection of their different crafts[1].

1. The substances behind taste

Tea’s “taste” (the gustatory part) is mainly set by these water-soluble substances[1][2]:

Many green teas retain substantial catechins and amino acids, often giving freshness alongside bitterness/astringency. During black-tea processing, some catechins transform into theaflavins, thearubigins and other products, changing taste and colour; dark-tea fermentation brings further polyphenol transformation. Exact levels and perception vary strongly with material and craft, so “highest” and “lowest” should not be inferred from category alone. (See leaf chemistry.)

2. The substances behind aroma

Tea aroma comes from trace volatile compounds — hundreds identified so far[3]. They arise by three broad routes:

• Native to the leaf (terpenes): e.g. linalool (sweet floral) and geraniol (rose), the mainstays of floral aroma[3].
• Enzymatic / stress-induced: wounding and enzymatic release during bruising and rolling generate floral-fruity compounds like cis-jasmone, nerolidol, indole and methyl jasmonate (see oolong zuoqing)[4].
• Heat-formed: Maillard reactions and pyrolysis during fixation, roasting and drying create pyrazines (chestnut, roasty) and other baked notes[5].

A single note usually arises from several compounds; the table gives the main correspondence for understanding, not the only source.

3. The character of the six tea types

• Green: fresh and brisk with returning sweetness, a touch of green bitterness. High catechins and amino acids; aromas of green leaf, chestnut (pan-fired) or seaweed (steamed)[1].
• White: delicate, sweet and downy, soft with little astringency. Amino acids and sugars stand out; light sweet-floral aroma; mellows with age[1].
• Yellow: mellow-sweet and gentle with low astringency, often a “toasty” note. Yellowing tempers green tea’s rawness[1].
• Oolong: richly floral-fruity, full and smooth with a long sweet finish. Partial oxidation balances polyphenols and amino acids; the most aromatic type, with fire notes in roasted styles[1][3].
• Black: sweet-floral, fruity and malty; bold and brisk. Theaflavins give briskness and brightness, thearubigins give body; Assam is malty, Darjeeling muscatel[1][2].
• Dark (ripe pu-erh): often mellow and smooth, aged and woody, with reduced astringency in many examples. Microbial fermentation and storage reshape polyphenols and aroma; “medicinal” or fungal notes are possible descriptors, not requirements[1][2].

4. How to “taste” a tea

Professional evaluation looks at five points: appearance, liquor colour, aroma, taste, infused leaf[6]. For everyday drinking, three steps: first smell (dry leaf, lid, liquor, empty-cup aromas); then taste (let the liquor coat the mouth and feel the layers and balance of bitter/astringent/umami/sweet); finally sense the returning sweetness and throat feel. The value of the flavour wheel is to give these elusive impressions a shared, comparable vocabulary.

The flavour code: how composition becomes “taste”

Connecting compounds to the senses — why each tea tastes the way it does:

See also

• The Science of each craft — how flavour is generated during processing
• Leaf chemistry · Brewing — how composition and brewing shape flavour

References

1. Wan Xiaochun. Tea Biochemistry (3rd ed.). China Agriculture Press, 2003.
2. Chen, G.-H., et al. (2009). Comparison of major chemical components in different kinds of tea. Journal of Agricultural and Food Chemistry, 57(15), 7325–7330.
3. Recent Advances in Volatiles of Teas. Molecules / PMC, 2018. https://pmc.ncbi.nlm.nih.gov/articles/PMC6273888/
4. Methyl Jasmonate-Induced Changes of Flavor Profiles During the Processing of Green, Oolong, and Black Tea. Frontiers in Plant Science, 2019. https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2019.00781/full
5. Ho, C.-T., Zheng, X., & Li, S. (2015). Tea aroma formation. Food Science and Human Wellness, 4(1), 9–27. https://doi.org/10.1016/j.fshw.2015.04.001 — Review of aroma formation and multi-compound contributions during processing.
6. GB/T 23776-2018. Methodology of sensory evaluation of tea. National Standard of the People’s Republic of China. — Evaluation framework for appearance, liquor colour, aroma, taste and infused leaf.

The wheel is an editorial aid for description and communication, not chemical analysis or a quality score. Compound links indicate possible contributions, not exclusive one-to-one causes; levels and perception vary with cultivar, craft, origin, storage, brewing and the taster.