Author: Aaron Fisher
There are some very useful tea terms that tea lovers use to communicate aspects of mouth-feel. In looking for these sensations, you will improve your sensitivity. Of course, such terms can also be misleading, if you focus on their meaning rather than trying to feel the actual sensation in the mouth. It is enough that you feel something. in other words. You don't need to be able to articulate it.
1) Gan（甘)/ Hai Gan (回甘): "gan" is a coolness or mintyness that fills up the mouth, a bit like breathing outside on a very cold winter day. It also sometimes refers to sweetness with a fragrance that travels on the breath-cooling the mouth in this way. We say a tea has "gan" when it stimulates the mouth with such a freshness. With "hui" there is a "remembrance", borrowing from the literal term "to reflect". This means the sweetness rises up from the throat after the tea is swallowed. It lingers, in other words.
2) Hui Tia (回甜): This is a clarification or distinction made to separate the cool, freshness of "huigan" with a sweet fragrance arising from the throat. When the sensation is accompanied with a predominate sweetness, we call it "huitian."
3) Sheng Jin (生津): This refers to a pleasant moistness caused by a tea. It means the tea causes salivation from under the tongue, and sometimes he sides of the mouth by the cheeks. It also coats the mouthy like oil or milk.
4) Ruan (圆): This is the smoothness' of the tea, A good tea has the texture of silk. It seems if all the atoms in the liquor are in the right place, coordinated and rounded. The tea liquor all stays together and is almost oily or gelatinous. It slides down the throat together, smoothly. Improperly prepared teas are rough, as if the atoms are jagged, misplaced and scratchy.
5) Gong Fu (功夫): Here this means "full-bodied". It means the tea is rich and complex, deep and subtle. The best teas have sensations, aromas and flavors that lead you onward - drinking them by gongfu tea set for years, you still discover new and amazing sensations. The best works of art are always like this.
6) Cha Yun (茶韻): This is a very elusive term. "Yim" literally means "to rhyme"; and "cha" is of course "tea". When a tea has "rhyme', it means it is well-rounded. A tea with "cha yun" transforms in the way the best teas do, as we discussed above. A tea with yun splashes up to the upper palate, rolls down the throat naturally and smoothly, coats the mouth and throat, causes salivation and gan. All the aspects of such a tea are comfortably and fit together the way lines of poetry do. Such a tea is, itself, a poem.