Sealed yellowing (men huang)

The categories this step defines

In tea, processing is not a modifier applied to a category — it is what creates the category. These are the types that exist because this step exists.

• Yellow tea — Sealed yellowing (men huang) applied to the fixed leaf, between fixation and final drying.

What it is

After fixation the leaf is still warm and still holds moisture. In yellowing it is heaped and wrapped — in cloth, paper or its own mass — and left to sit, sometimes for hours and sometimes for days, occasionally being opened, redistributed and re-covered. Held warm and damp without air, the leaf undergoes a slow non-enzymatic change that takes the colour from green to a soft yellow-olive and rounds off the sharp vegetal note that fixation leaves behind. It is the step most often skipped, because it is slow, hard to judge and adds no weight to the finished tea.

Also transliterated as: men huang, menhuang, mun huang.

What it does to the leaf

Holds fixed, still-damp leaf warm and enclosed so that slow non-enzymatic change proceeds without the browning that free air would allow.

What it does to the cup

Removes the grassy edge of a fresh green tea, leaving a mellower, sweeter, faintly grain-like or corn-like cup with markedly less astringency.

Variants that matter

Ways this step is carried out that produce genuinely different results, rather than regional names for the same thing.

Short yellowing

A few hours, applied to bud-heavy teas such as Junshan Yinzhen where too long would flatten the delicacy entirely.

Extended yellowing

Repeated over several days on leafier material, giving a deeper colour and a rounder, grain-sweet character.

Other steps at the Yellowing stage

• Wet-blank and dry-blank yellowing — Whether the smothering step is done on damp leaf straight from fixation or on part-dried leaf, which is the main axis separating one yellow tea from another.

Teas that go through this step

• Beigang Mao Jian
• Guangdong Da Ye Qing
• Huoshan Huang Da Cha
• Huoshan Huangya
• Junshan Yinzhen
• Meng Ding Huang Ya
• Weishan Mao Jian
• Wenzhou Huang Tang
• Yuan An Lu Yuan

Guides covering this step

• What is yellow tea? — The rarest of the six categories: green tea given one extra smothering step. The step is slow, adds no yield, and is skipped often enough that most tea sold as yellow tea is not.
• How processing changes flavour — One species, six categories, and the whole difference is a sequence of decisions about heat, damage and time. This is the single idea that makes the rest of tea legible.
• Three different changes, one misused word — Oxidation, yellowing and microbial fermentation are three unrelated processes that English-language tea writing routinely calls by the same name. Separating them is not pedantry — it is what makes half the category descriptions in tea stop contradicting each other.
• How yellow tea is made, and why it nearly disappeared — Yellow tea is green tea with one extra step, and that step takes days, adds no weight, is hard to judge and produces a tea most buyers cannot distinguish from a green one on a shelf. The category has been quietly abandoned for exactly those reasons.
• Yellow tea: a whole category made by inserting one step — Nothing is substituted and nothing is removed. A Chinese green tea route with one operation added between the fixation and the finishing bake produces a sixth category, and that is the only place in tea where such a thing is literally true.