little sip

Cup Notes 01 · Tea

One plant.
Three tea paths.

Green, oolong and black tea all begin with Camellia sinensis. What happens after picking helps make each cup its own.

Tea1-minute film2-minute read

By Little Sip ·

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60 seconds · Narration, music & on-screen captions
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The field notes

Green, oolong, black.
What changes?

Tea is not one flavor or one process. Green, oolong and black tea come from the same plant species, Camellia sinensis, but their leaves take different paths after picking. Oxidation is one useful way to understand those differences.

  1. Green tea

    Heat comes early

    Early heating deactivates the enzymes that drive oxidation, limiting it. Steaming and pan heating are two ways tea makers do this.

  2. Oolong tea

    A wide middle ground

    Oolong is partially oxidized before heating stops those enzyme-driven changes. It spans a wide range: some styles are lightly oxidized, while others go much further.

  3. Black tea

    More time to transform

    Black tea is extensively oxidized before heating and drying. That processing develops characteristic color and aroma, though black teas are far from all alike.

Next time you see a tea you haven’t tried, look for its name, growing place and processing style. What might its journey have been?

Read the narration Full video transcript

Green, oolong, black. How does one tea plant make all three?

Meet Camellia sinensis, the tea plant. What happens after picking helps shape your cup.

One part of that story is oxidation: leaf compounds reacting with oxygen, helped by natural enzymes.

For green tea, heat comes early in processing. It deactivates those enzymes, limiting oxidation.

Oolong is partially oxidized. Some styles are lightly oxidized; others go much further.

Black tea is extensively oxidized before heating and drying, developing color and aroma along the way.

But processing is only part of it. Plant variety, growing place, and when the leaves are harvested also shape each tea.

That's three paths through a much bigger tea world. Which tea would you explore next?

Follow the leaves · Sources

  1. NC State ExtensionCamellia sinensis: the tea plant and its uses.
  2. Japan Ministry of Agriculture, Forestry and FisheriesTea types and processing, including the role of heating (Japanese).
  3. Tamil Nadu Agricultural UniversityTea processing and the development of black tea.

A beginner’s overview of these tea styles. Sources checked October 27, 2026.

A little more familiar with your cup.

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