Bitterness: taste, not tannin

Name: Domaine aux Conseillans
Address: 35 Chemin du Limancet, Saint-Caprais-de-Bordeaux, Nouvelle-Aquitaine, 33880, FR
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The standard

The separate sense attribution assigns each sensation to the sense that carries it: bitterness to taste, the drawing-together to touch. Only this separation makes a description verifiable.

Criteria

Bitterness is tasted, not felt by touch
Its source is phenolic compounds, not acidity
It is kept separate from astringency as its own stimulus

Distinction

Bitterness ≠ astringency: bitterness is a taste on the tongue, astringency a drawing-together of the mucous membrane. Bitterness ≠ acidity: one comes from phenols, the other from acids. The separate sense attribution keeps the two apart.