Not quite black. Not quite anything else.

Open a tin of first flush Darjeeling and the first thing that surprises you is the colour. The leaves are green, or close to it; silver-tipped, springlike, delicate. Nothing like the dark, wiry, copper-brown leaves of an Assam or a Ceylon. You brew it at around 85 degrees rather than a full boil. The liquor is pale gold. It smells of fresh grass and white flowers and something faintly muscatel. It tastes nothing like a typical black tea.

And yet: the tin says black tea. The Tea Board registers it as black tea. Every export certificate, every auction lot, every supermarket label calls it black tea.

The classification is technically defensible and practically misleading in equal measure. Here is what is actually happening inside the factory, and why the label on the tin is, to put it gently, a category stretched to its limits.

What oxidation actually does to a leaf

When a fresh tea leaf is damaged, its cell walls rupture and enzymes called polyphenol oxidases are released. These react with oxygen and, over time, transform the leaf’s green chlorophylls into darker theaflavins and thearubigins. This is oxidation, and it is what turns a green leaf brown and develops the malty, brisk character associated with black tea. Full oxidation takes two to three hours in a typical black tea factory.

The Chinese classification system defines teas by their oxidation level: green tea is unoxidised, oolong sits in the 20 to 80 percent range, and black tea, called hongcha, red tea, in Chinese, for the colour of the liquor, is fully oxidised at 90 to 100 percent. By this system, a tea’s category is largely a function of how long and how much the leaf was allowed to oxidise before drying halted the process.

This is where first flush is usually said to be an oolong. Published figures put it between 20 and 30 percent, and a few go as high as 70. So I asked the people who process our leaf. They put it at around 15 percent, which does not reach the oolong range at all. It sits just past a white tea.

The hard wither, and what it prevents

The reason first flush ends up so lightly oxidised comes down to a specific step in processing called the wither. After plucking, leaves are spread in warm air for an extended period to lose moisture. For first flush, this is an aggressive, prolonged wither that can reduce the leaf’s water content by more than half. The spring leaves are young and delicate, and the hard wither desiccates them before the rolling and oxidation stages even begin.

This matters because oxidation requires moisture. Polyphenol oxidase needs water to function. A leaf that has already been aggressively dried before rolling simply cannot oxidise as fully or as quickly as a juicier, more robust summer leaf. The factory manager at Risheehat estate put it plainly: after the wither and a brief, light roll under minimal pressure, the leaves go straight to the drying chamber with almost no fermentation step at all.

Second flush, picked from May to June, is a different tea in both character and chemistry. The leaves are fuller and carry more juice, the roll is harder, and oxidation runs its full course.

So why is it called black tea?

The answer is historical, not scientific. Darjeeling’s tea industry was built by British planters for British buyers. The British palate at the time demanded strong, fully oxidised black tea, taken with milk and sugar. Classification followed market expectation: everything produced in Darjeeling was black tea, because that was what Darjeeling produced.

The shift toward lighter processing came not from within India but from Germany. German buyers in the 1960s and 1970s wanted a more delicate, aromatic style, drunk without milk, and would pay more for it. Planters responded by shortening oxidation, and the first flush became the light, floral tea it is today. The classification never followed. It stayed “black tea” by convention, and because the Tea Board had no other category to put it in.

“Because the Indian tea industry is not familiar with the oolong tradition, the tea is still referred to as black tea following convention.”

Happy Earth Tea, on Darjeeling first flush processing

Where the oolong argument breaks down

Even if the number did reach into the oolong range, that alone would not make it an oolong, and this is where tea people push back. What defines an oolong is its production method rather than its oxidation level, and that method includes specific steps which Darjeeling processing does not use.