Astringent

A drying, puckering sensation rather than a taste — and the single most reliable indicator of under-fermentation.

Astringency is not bitterness and it is not a flavour. It is a tactile sensation caused by polyphenols binding salivary proteins, which is why it dries and puckers the mouth rather than registering on the tongue.

Separating it from bitterness is the most useful skill a chocolate taster can develop, because the two have different causes. Bitterness is largely inherent to the bean and the percentage. Marked astringency means polyphenols were not reduced, and polyphenol reduction is what fermentation does — so a bar that dries your mouth out is telling you about its post-harvest handling.

Descriptors used: drying, puckering, chalky, tannic, green
Desirable?: Mild astringency is normal and structural. Pronounced astringency is the most common fault in chocolate.

Where it comes from

The route by which this note arrives in the chocolate.

From the bean's genetics
Inferred
Forastero material carries higher polyphenol content than Criollo-descended types, so some astringency is inherent.
How to tell: Inherent astringency is mild and integrated. If it dominates, the cause is fermentation rather than genetics.
Source: ChocolateHQ

When it is a fault

Under-fermentation leaves polyphenols unreduced. Those polyphenols bind salivary proteins, producing the drying sensation.

How to tell: The mouth feels dry and rough after swallowing. This is the most common quality fault in chocolate and it is a fermentation failure, not a percentage effect.

Recorded Source: Wiley-Blackwell

Covered in

Fermentation explainedThe clearest sensory signature of under-fermentation.
Chocolate tasting vocabularyHalf of the most commonly confused pair.

Compared in

Bitterness vs astringencySet against Bitterness, which readers frequently believe is the same thing.

Varieties known for this

ForasteroWithin this variety's aromatic potential. Variety sets a ceiling rather than a result. A drying, puckering sensation rather than a taste — and the single most reliable indicator of under-fermentation.
CCN-51Within this variety's aromatic potential. Variety sets a ceiling rather than a result. A drying, puckering sensation rather than a taste — and the single most reliable indicator of under-fermentation.

Developed during

FermentationThis stage is where the note is created, amplified or destroyed. A drying, puckering sensation rather than a taste — and the single most reliable indicator of under-fermentation.

Sources

ChocolateHQ editorial synthesis — ChocolateHQ(citation identity confirmed; passage not re-read)
Chocolate Science and Technology — Wiley-Blackwell(citation identity confirmed; passage not re-read)