Acidity

Acidity is the bright, lively sharpness you taste in coffee, often reading as fruity, citrusy, or wine-like. In specialty coffee it is a good thing, not a flaw. It is the snap that makes a cup feel fresh and clear rather than flat. Confusingly, this is a sensory quality, not a measure of how harsh or stomach-unfriendly a coffee is.

Why it matters: pleasant acidity is one of the clearest markers of well-grown, carefully processed coffee. When it is balanced, people often call it brightness. When it tips too far, it can read as sour or aggressive, which overlaps with sourness from under-extraction.

Where it comes from: high altitude grows denser beans with more acidity, and washed processing tends to keep acidity clean and distinct. Lighter roast levels preserve it; darker roasts burn it off. In the cup, acidity works alongside sweetness and body to create overall balance.