Brettanomyces (or "brett") is a wild yeast that can create distinctive aromas in wine ranging from subtle (leather, spice, earthy) to obvious (horse sweat, band-aid, funk). The yeast survives in low-sulfite environments and can produce desirable complexity (particularly in some European wines) or obvious faults. The line between desirable brett complexity and undesirable brett taint is subjective; some wine critics celebrate it as character, others consider high levels faulty. Understanding brett character is key to evaluating wine quality.
WHY IT MATTERS FOR COLLECTORS
Brett character is debated; moderate levels are sometimes appreciated for complexity, excessive levels indicate spoilage. Context and personal preference determine whether brett is desirable.
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