Smoothness
The absence of edges. A smooth tea goes down without catching anywhere, with no scratch, no drag and nothing sharp. It is the one axis on this list defined mostly by what is missing.
- Sensed as
- mouthfeel
- Compounds
- not established; reported as the inverse of astringency
- Rises with
- cooler water, a rinse, more leaf for body, age, roasting, fermentation
- Falls with
- hotter water, longer steeps, very young raw leaf
What it is
A mouthfeel, and a negative one. Where body describes how much the liquor weighs, smoothness describes how easily it moves. Tasters reach for silky, velvety, round and mellow, and all four are pointing at the same thing: nothing in the cup is snagging. It is closely tied to how a tea finishes, since roughness usually shows up after the swallow rather than during it.
Where it comes from
Not established as a single compound, and it is more useful to treat it as the inverse of astringency than to hunt for one. A cup with little free catechin activity feels smooth; a cup with a lot feels rough. Ageing, roasting and microbial fermentation all reduce the astringent fraction, which is why all three make teas that read as smoother. Body contributes too: a viscous liquor coats the mouth and masks small roughnesses that a thin one leaves exposed.
Which teas show it
Aged shou puer, which is the reference point. Well-roasted and rested oolongs. Aged white teas. Good black teas brewed at sensible strength. Young sheng and hard-brewed green teas sit at the other end, and in a young sheng that roughness is structure rather than a defect.
How to turn it down
Rarely wanted. Hotter water and longer steeps will roughen any tea quickly.
How to turn it up
Everything that lowers astringency: cooler water, shorter steeps, a rinse to take the first dusty extraction off the leaf. Then raise the leaf ratio to add body, which cushions what is left. Age does the rest, and does it better than any brewing change.
What it gets confused with
Sweetness, which is the frequent one: a cup with no rough edges reads as sweeter than it measures, and a cup with plenty of sugar and plenty of astringency does not read as sweet at all. Also confused with body, since a thick tea feels smooth even when it is not, and with mineral, since both get described by what they lack.
What people get wrong
Treating smoothness as the goal for every tea. A young sheng, a first flush Darjeeling and a brisk Assam are all meant to have edges, and smoothing them out with cool water gives you a weak cup rather than a refined one. The other mistake is assuming a smooth tea is a well-aged one. Roasting and heavy fermentation get there in months, so smoothness is not evidence of age.
