Barrel fermentation occurs when grape juice ferments directly in wooden barrels rather than in stainless steel tanks. This technique is common for premium white wines (particularly Chardonnay and Burgundy) and some reds. The barrel's oak imparts flavour compounds while the wood's semi-permeability creates micro-oxidation that adds complexity. Barrel fermentation requires careful temperature control and adds cost, but produces wines with integrated oak character and richer texture than tank-fermented wine racked into barrels post-fermentation.
WHY IT MATTERS FOR COLLECTORS
Barrel-fermented wines typically show more integrated oak character and creamy texture than tank-fermented alternatives. This technique is a hallmark of premium white Burgundy and quality California Chardonnays.
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