Wine · Terminology

Acidity

The tart, mouth-watering component that gives wine its freshness and its structure.

Acidity is the tart, mouth-watering element of a wine — the thing that makes you salivate a beat after you swallow. It comes mostly from the grape itself: tartaric and malic acid are present in the berry, and lactic acid appears later if the wine goes through malolactic conversion.

Acidity is a structural component, not a flavour. It is what keeps a sweet wine from tasting cloying, what makes a light white refreshing, and what lets a wine age for decades. Wines are described on a scale from low through medium to high, judged by how much your mouth waters, not by how sour the wine smells.

In practice

  • Grapes lose acid as they ripen, so picking date is the grower's main acidity lever.
  • Cool climates hold acidity; warm climates burn it off — the single most useful rule in blind tasting.
  • Naturally high-acid varieties: Riesling, Chenin Blanc, Nebbiolo, Sangiovese.
  • In warm regions, winemakers may acidify the must with added tartaric acid; in cool ones they may soften it with malolactic conversion.

Where you'll meet it

  • Every structured tasting note: acidity sits alongside tannin, alcohol, body and residual sugar.
  • German Prädikatswein, where high acid balances high sugar.
  • Champagne, where searing base-wine acidity is the whole point.

How to judge it

Acidity is measured on the sides of the tongue and in how quickly saliva returns. A reliable test: swallow, then count. If your mouth floods within a second or two, you are looking at high acidity.

Two traps:

  • Sugar masks acid. A sweet Riesling can carry more measurable acid than a bone-dry Chardonnay and still taste softer. Judge the salivation, not the sweetness.
  • Alcohol masks acid too. A hot, 15% red can read "soft" when its acid is merely outgunned.

Why it matters

  • Ageing. Acidity is a preservative. Wines built to last — Riesling, Chablis, Barolo, vintage Champagne — are almost always high-acid.
  • Food. Acidity is what makes wine work at the table: it cuts fat and refreshes the palate between bites.
  • Diagnosis. Too little and the wine is flabby; the wrong kind — acetic — and it is showing volatile acidity.

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