A wine fault is defined as being caused by external factors that have a negative influence on the wine. Often uncleanliness or mistakes in wine-making operations can be the cause. Other faults include cork taint, mustiness, hydrogen sulphur, volatile acidity, premature aging and oxidation, taste of wet cardboard, astringency and medicinal note, amongst others. We generally regard a fault caused by micro organisms as a wine disease.
vat or vessel for red wine fermentation
Generally, red wine ferments on the skins in vessels constructed of stainless steel or oak. These fermentation vessels are often equipped with temperature control regulators and technical aids (pumping over, punching down the cap, stirring elements, gas circulation), to keep the must moist and to achieve desired extraction of colour and tannin.