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How Tea Types Are Classified: White, Green, Oolong, and Black Tea

Tap a tea type to see how its processing differs.

White Tea

Oxidation level: minimal (barely processed). Made from young leaves and buds with minimal processing, giving it the subtlest, most delicate flavor of all tea types.

Green Tea

Oxidation level: none. Heat is applied immediately after picking to deactivate the oxidizing enzymes, preserving the leaf's green color and fresh flavor.

Oolong Tea

Oxidation level: partial (10-80%). Oxidized to a level between green and black tea, giving it an especially wide range of aroma and flavor depending on the exact oxidation level.

Black Tea

Oxidation level: full. Fully oxidized to produce a deep color and rich flavor β€” the most widely consumed type of tea in the world.

Pu-erh Tea (Dark Tea)

Oxidation level: fermented (post-fermentation via microorganisms). Undergoes microbial fermentation rather than simple oxidation, and is said to develop deeper flavor the longer it ages, much like wine.

Yellow Tea

Oxidation level: light fermentation (via a "sealed yellowing" process). Similar to green tea, but with an added unique smothering step called "men huang" that gives it a rare, soft, subtly sweet character.

All Tea Actually Comes From the Same Plant

Green tea, black tea, and oolong tea are all made from the leaves of the same tea plant, Camellia sinensis. The only difference lies in "how much the leaf is oxidized" after being picked β€” and that difference in processing produces completely different colors, aromas, and flavors.

Caffeine Content Also Varies by Type

As a general tendency, tea that has been more heavily oxidized or fermented, and tea made from younger leaves, tends to have higher caffeine content β€” though brewing time and temperature can also significantly affect the final result.

Frequently Asked Questions

Does caffeine content also vary by tea type?

Generally, more heavily oxidized or fermented tea, and tea made from younger leaves, tends to have higher caffeine content, though brewing time and temperature can significantly change the outcome as well.

Is pu-erh tea always better the older it is?

When aged under proper storage conditions, the flavor does deepen, but improper storage can actually degrade the quality β€” so older isn't automatically better.