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For a good dark tea, one of the first and most important things to observe is the liquor colour. From the appearance of the liquor, we can often make a preliminary assessment of the tea’s quality. For tea drinkers, learning to read the liquor colour adds another dimension to tea appreciation and helps distinguish differences in quality.
A high-quality dark tea usually produces a liquor that is clear, bright and glossy, with noticeable viscosity and body. In four words, it can be described as “deep red, rich and bright.” By contrast, poor-quality dark tea may produce a liquor that looks blackish, dull and cloudy.
The liquor of dark tea can mainly be evaluated from six dimensions: colour, brightness, transparency, cleanliness, viscosity, and changes over time and successive infusions. It is also worth observing whether a golden ring appears around the rim of the cup. In some well-aged and well-stored teas, a golden halo may be visible around the edge of the liquor. The surface of the liquor may also show an oily sheen or a thin oil-like film.
First, look at the colour of the liquor. This does not simply mean judging whether the colour is dark or light, but identifying its actual hue and colour family.
Taking ripe Pu-erh tea as an example, because it undergoes wo dui, or pile fermentation, its liquor usually ranges from reddish-brown to rich red, then deep red, and eventually chestnut red.
Although the liquor of a high-quality ripe Pu-erh can be very dark, it should not look simply black or opaque. A good liquor is usually deep yet bright, with red tones that may resemble red wine, amber-red, jujube-red, ruby-red, or a rich crimson red.
Second, observe whether the liquor is bright and luminous. This is particularly important in Pu-erh tea evaluation, where brightness is highly valued.
Brightness does not refer to how light or dark the colour is. Rather, it refers to the liquor having lustre, vitality and brilliance, appearing almost like glass or crystal when viewed under light.
Newly produced dark tea may have a deep-red liquor that is not yet highly transparent. As time passes, a dark tea aged for around ten years may gradually become brighter and more transparent.
A Pu-erh raw tea aged for around 30 years may develop a jujube-red liquor, sometimes with a slight oily sheen floating on the surface. Dark tea aged for more than 20 years, or properly aged vintage raw Pu-erh of 50 years or more, may develop an amber-red liquor that is vivid, rich and brilliant, sometimes giving the impression that the liquor itself is glowing.
When dark tea is stored under proper conditions, even after many years of ageing, its liquor should not simply become black, dull and lifeless.
Third, observe the transparency or clarity of the liquor.
Pour the tea into a white porcelain cup or a transparent fairness pitcher and observe it both from the side and from above. A good tea liquor should normally show a certain degree of clarity and transparency.
Even when the liquor of ripe Pu-erh is very concentrated and dark, it can still be deep yet clear, rich yet transparent.
Clarity is especially important. For example, a good ripe Pu-erh may appear deep red, chestnut red or even close to wine-red, but when held against the light, it should still display an attractive translucence.
However, cloudiness does not automatically mean that a tea is poor in quality. Tea that has recently been compressed, a high proportion of broken leaves, very old tea, tea that has been broken too finely during prying, overly forceful pouring, insufficient filtration, or even a high concentration of soluble substances may temporarily cause cloudiness.
Fourth, examine the cleanliness or purity of the liquor, particularly whether there are visible impurities or suspended particles.
Clarity and cleanliness are related but are not exactly the same. Clarity mainly refers to transparency and light transmission, while cleanliness refers to whether the liquor looks visually pure and free from fine particles or foreign matter.
For example, a properly aged dark tea may produce a beautiful amber or jujube-red liquor, but the colour should appear natural and harmonious. If the liquor contains obvious blackish matter, excessive cloudiness or visible floating particles, this may indicate a quality problem.
If there are obvious impurities and the liquor looks muddy, it is certainly not a desirable liquor for high-quality dark tea.
Fifth, observe the viscosity of the tea liquor. In professional tea tasting, this is often described as body, thickness, mouthfeel, or an oily texture.
If colour is the external appearance of the liquor, viscosity is its “flesh and structure.” It is one of the key indicators determining whether the liquor feels full-bodied and substantial.
Viscosity is essentially a tactile sensation rather than a taste. It describes the perceived weight, density and resistance of the liquor in the mouth.
To experience this, gently move the tea liquor around the mouth with the tongue. A good tea may feel somewhat like rice broth or diluted honey, with noticeable body, resistance and weight on the tongue. A poor-quality or thin tea may feel more like plain water—light and lacking substance.
When swallowing, pay attention to smoothness in the throat. A viscous, high-quality tea liquor may flow down smoothly like silk and leave a lingering sensation in the throat, often described as throat resonance or “hui yun”. A thin liquor, by contrast, simply passes through without leaving much sensation.
High-quality tea liquor may also display an oily sheen or oil-like film on the surface. When gently swirled, it can appear dense, smooth and oily. This is often associated with a rich concentration of soluble compounds. A watery, thin liquor generally indicates a less substantial tea.
However, viscosity does not mean bitterness or excessive concentration. Tea that has been steeped for too long may become strong and bitter, but this is concentration rather than true body. A thin tea can be brewed very strong and still taste like bitter water without developing real substance.
Likewise, viscosity should not be confused with cloudiness. A viscous liquor can still be clear, transparent and bright, much like concentrated honey water that still allows light to pass through. Cloudiness, on the other hand, results from suspended particles and may indicate problems with the tea or its processing.
Finally, observe how the liquor changes. This can be considered from two perspectives.
Tea liquor changes gradually after brewing the first. Although these changes may be subtle, experienced tea drinkers can often notice them. A good liquor may become fuller with a longer infusion while remaining mellow rather than excessively bitter. In general, dark tea liquor becomes deeper and darker with prolonged steeping.
Secondly , observe how the liquor changes over successive infusions. A good dark tea usually demonstrates both infusion endurance and stability.
Naturally, the liquor colour will gradually become lighter with repeated infusions, but the transition should be smooth and progressive.
Taking ripe Pu-erh as an example, the liquor may gradually change from deep red or rich red to bright red, then reddish-orange, and finally orange-red. It should not be almost soy-sauce black in the first infusion and then suddenly become extremely pale by the third or fourth infusion.
It should be noted that even when a tea liquor is rich red and bright and performs well according to all six dimensions above, this alone does not prove that the tea is of high quality. The overall quality of a dark tea must still be evaluated together with its aroma, flavour, infused leaves and storage conditions.
Pu-erh is one of the most common teas associated with the dark-tea category. Pu-erh is generally divided into raw Pu-erh (sheng Pu-erh) and ripe Pu-erh (shou Pu-erh). Ripe Pu-erh is a standard post-fermented tea, while raw Pu-erh is more complicated.
As mentioned above, when raw Pu-erh is stored professionally under appropriate conditions, it undergoes gradual post-fermentation during ageing. After around 30 years of ageing, depending on temperature and humidity, the degree of fermentation may become very high. After around 50 years of ageing, the fermentation level may become even more advanced, giving the tea many characteristics associated with dark tea.
When observing liquor colour, it is advisable to use a white porcelain cup or a transparent fairness pitcher (gongdao bei) under natural light or bright white light. Observe the liquor as soon as possible, preferably within ten minutes after pouring, because the liquor may deepen in colour as its temperature falls and time passes.
For raw Pu-erh, attention is often given to its structure, strength and energy, with the liquor enveloping the mouth. For ripe Pu-erh, greater attention is given to its smooth, glutinous and silky texture. A good Pu-erh should create a full, enveloping sensation in the mouth, and viscosity provides an important foundation for carrying its aroma and lingering character.
A useful formula for observing tea liquor is:
First observe the colour; then look for brightness, transparency and clarity; finally examine its body, viscosity and changes over successive infusions.
The liquor colour of dark tea should not be used as a direct indicator of age.
The liquor of raw Pu-erh generally develops from yellow towards orange and red as it ages. Ripe Pu-erh, because of its pile fermentation, can already produce a rich red liquor when relatively young. Therefore, a truly good liquor should be judged more by its brightness, transparency, cleanliness and natural appearance than simply by its depth of colour.
The depth of the liquor alone cannot determine the age of a dark tea. Brewing concentration, leaf-to-water ratio and infusion time can all directly affect liquor colour. Comparisons should therefore be made under standardised brewing conditions. A small quantity of old tea may produce a light-coloured liquor, while a young tea brewed for a long time may produce a very dark liquor.
The phenomenon known as “creaming” or “tea cream” should not automatically be regarded as spoilage or undesirable cloudiness. Some high-quality dark teas may develop a small amount of flocculent precipitation after cooling. When reheated, the liquor may become clear and bright again. This is entirely different from a liquor that appears grey, dull and cloudy while still hot.
Another phenomenon sometimes occurs when brewing dark tea: the first infusion may appear cloudy, while later infusions become clear. This is quite common. Possible causes include the tea cake being broken too finely, partial carbonisation in very old tea, excessive tea dust, fragments produced during transportation, fine particles on the surface of the leaves, overly forceful water pouring, or differences in filtration. The actual cause should be assessed according to the individual tea.
A liquor that is dark, blackish and lacking brightness may suggest excessive pile fermentation or damp and poorly ventilated storage, sometimes associated with a strong storage odour or “warehouse character.”
Cloudy liquor containing obvious suspended material may be associated with contamination, improper processing, foreign matter introduced during production, or artificial ageing practices. If raw Pu-erh develops a very deep red liquor unusually early, attention should be paid to the possibility of artificially accelerated ageing through high-temperature and high-humidity storage rather than natural maturation.
Naturally aged Pu-erh generally develops its liquor colour gradually while retaining transparency. Artificially aged or excessively wet-stored dark tea may have a deep colour but can also show cloudiness, watery flavour or undesirable storage odours.
Practical Tips for Observing Dark Tea Liquor
1. First observe the overall colour, then examine its transparency and lustre.
2. Look for a golden ring around the rim of the cup and an oily sheen on the surface. These can be positive characteristics in a good tea.
3. Examine the infused leaves together with the liquor. A tea with an attractive liquor will often also have relatively even, bright and supple infused leaves.
4. Do not judge quality simply by how dark the liquor is. A newly produced tea may naturally be dark red, while a well-aged tea may develop a rich red liquor. Redness is only the foundation; transparency is the key.
5. Taste and compare many different teas to build your own sensory memory. Liquor colour is only one part of the four basic stages of tea evaluation: observing the liquor, smelling the aroma, tasting the flavour, and examining the infused leaves. The final judgement must always be based on an overall sensory evaluation.
In summary, a good dark tea liquor should display a bright, translucent red colour with a crystalline reddish-brown appearance. Ripe Pu-erh in particular should ideally show a rich red, bright, glossy and transparent liquor.
Always remember: brightness, transparency and an oily lustre are more important than simply being red or dark.
Through repeated tasting and careful observation of teas of different ages, origins and storage conditions, one can gradually develop the ability to read the quality of dark tea through its liquor.