Tannin inside the phenolic family
Understand what tannins are, where they come from, and why bitterness and astringency must be described separately.
The argument
What this chapter will give you
Tannin is the guest who shakes hands with your saliva. The useful question is not merely how much is present, but when the grip arrives and what texture it leaves behind.
This is a reading chapter, not a definition enlarged to fill a screen. Its sections build the idea from mechanism and method to the language you can use in front of an actual glass.
Drying is not a taste
Astringency is a tactile sensation linked to interactions among tannins, saliva proteins, and oral surfaces. It can feel powdery, chalky, furry, fine, or coarse, and it often builds after swallowing or spitting.
Do not collapse bitter and tannic
Bitterness is a taste; astringency is primarily touch. Tea can carry both, which is why you should wait, notice location and timing, and describe the sensations separately.
Phenolic compounds: the family tree
‘Phenolic’ describes chemical structure, not one flavour. The defining feature is a phenol unit: an aromatic carbon ring with a hydroxyl group attached. Grapes contain many related compounds. Anthocyanins are important red and purple pigments; flavan-3-ols can occur as smaller molecules or join into condensed tannins; phenolic acids and other non-flavonoids take part in colour and oxidation chemistry. Most grape phenolics are concentrated in skins, seeds, and stems rather than the juice, while oak can add another set during maturation. Crushing, maceration, fermentation, pressing, oxygen, pH, temperature, and time affect which compounds enter the wine and how they later react. Their roles overlap: some influence colour, some bitterness or astringency, and many are not directly tasted at all. The key relationship is one-way: tannins are phenolic compounds, but phenolic compounds are not all tannins.
Astringency is an interaction
Tannins are a varied group of phenolic compounds. Their interactions with salivary proteins and oral surfaces can reduce lubrication and create drying, roughing, or puckering sensations. The response depends on tannin structure, concentration, the wine matrix, saliva, and the taster. ‘More tannin’ therefore does not guarantee one predictable texture.
Bring it back to the glass
Three checks before the conclusion
- Separate bitter taste from drying, roughing, or puckering touch.
- Locate the sensation: gums, cheeks, tongue, or the whole mouth.
- Describe grain—silky, powdery, chalky, furry, coarse—separately from intensity.
The language bench
Solid things you can actually say
Use these as sentence shapes, not answers to copy. Replace the details with what your glass can defend.
What is aroma, not tannin?
- “The wine smells of black fruit and dried herbs; neither aroma proves tannin level.”
- “Cedar-like aroma suggests a possible oak influence, while the grip is a separate observation.”
- “The floral aroma is delicate even though the palate is firmly structured.”
Is it bitter, sour, or both?
- “There is moderate bitterness at the back of the tongue after swallowing.”
- “The wine tastes tart before the drying sensation begins.”
- “Bitterness is low, despite a pronounced astringent grip.”
How does the grip behave?
- “Fine, powdery tannins gather along the gums and build slowly.”
- “The texture is coarse and mouth-drying, with the strongest grip inside the cheeks.”
- “Tannin is moderate in intensity but persistent, lasting beyond the fruit.”
How does tannin fit the wine?
- “The firm tannin is balanced by concentrated fruit and acidity.”
- “The wine is lightly tannic but not soft: acidity still gives it structure.”
- “The grip feels integrated because it rises gradually rather than interrupting the mid-palate.”
Make the sentence earn its keep
“It is very tannic.”
“A pronounced, chalky dryness builds on the gums and persists for about ten seconds.”
Intensity, texture, location, and duration turn a label into a reproducible observation.
Try it now
A five-minute field exercise
- Compare two cooled teas with equal sip sizes.
- Score bitterness and drying on separate lines.
- Add texture, location, onset, and persistence without using a quality word.
The line worth keepingDrying is a feeling; dry wine describes sweetness.