This gives ice wine its characteristic refreshing sweetness balanced by high acidity. Sourness is the taste that detects acidity. Chiantis tend to have medium-high acidity and medium tannins. German Pinot gris are more full-bodied with a balance of acidity and slight sweetness. Apple cider vinegar is noted for its high acidity and flavour. Sauternes are characterized by the balance of sweetness with the zest of acidity. The wine is noted for high acidity and berry flavors. Soil pH is a measure of the acidity or basicity (alkalinity) of a soil. This is a crucial factor in acidity and alkalinity and much environmental and geochemical work. It is used in chemical analysis as an indicator for acidity and alkalinity. Wine vinegar tends to have a lower acidity than white or cider vinegars. These organisms are required for acidity and flavour development. These cation exchanged zeolites possess different acidity and catalyse several acid catalysis. Well made examples will have a balance of fruit, acidity and texture. The acidity of hops is a preservative.