China's Six Tea Categories — An Overview

Many assume tea is classified by colour or region. In fact, China’s “six tea categories” are defined by craft — and the core variable steering that craft is the degree and manner of the leaf’s oxidation.

What a single fresh leaf becomes depends on how you treat its enzymes and oxidation: press pause at once (green), let it run to the end (black), or stop somewhere in between (oolong). The oxidation spectrum below lays out all six at a glance:

Note that green, white, oolong and black sit roughly along one axis — “enzymatic oxidation from none to full” — while yellow tea takes a non-enzymatic moist-heat yellowing route, and dark tea relies on microbial post-fermentation. These two take a different path, so they are listed separately.

The six categories, side by side

Each category is defined by a chain of steps, usually with one key step that determines its essence. Click a name to read the science behind it:

The logic: why classify by craft

The “six categories” framework, proposed by tea scientist Chen Chuan in the 20th century, is organised by processing method (and the resulting quality) rather than by leaf colour or origin. Its strength is that it captures the essence — tea’s endless variety stems from different ways of handling enzymes and oxidation:

• Green: earliest kill-green; enzymes deactivated at once → no oxidation, keeps its green.
• White: no kill-green, no rolling, long withering → slow, light oxidation.
• Yellow: green tea plus a men-huang step → moist-heat yellowing (non-enzymatic).
• Oolong: zuoqing controls partial edge oxidation → semi-oxidised, richly aromatic.
• Black: cells ruptured, full oxidation → fully “fermented,” red liquor and leaf.
• Dark: piled after primary processing → microbe-driven post-fermentation.

One line to remember: oxidation from none to full — green (none) → white (light) → yellow (moist-heat yellowing) → oolong (partial) → black (full) → dark (post-fermentation).

And “reprocessed teas”

Beyond the six basic categories are reprocessed teas that use them as raw material — for example flower-scented teas (like jasmine tea) and compressed teas pressed into cakes, bricks or nests. They are not a “seventh category” but extensions of the six.

Further reading · the science of each craft

• Green-tea fixation · White-tea withering · Yellow-tea yellowing
• Oolong zuoqing · Black-tea oxidation · Dark-tea wodui

References

1. The six-category framework (Chen Chuan; organised by processing method) — see general tea-science texts. (Authoritative textbook citation to be added.)
2. Oxidation ranges are common approximations; see the cited literature in each “The Science” article.