Harmless but Stubborn: Understanding the Nature of Whiskey Fungus
Via The Whiskey Wash
Summary
Whiskey fungus — scientifically known as Baudoinia compniacensis — is a dark, sooty mold that thrives on the ethanol vapors released during spirit aging, commonly called the angel's share. It grows on virtually any surface near distilleries and aging warehouses, coating buildings, trees, fences, and cars in a persistent black film in communities surrounding major whiskey producers.
Despite its alarming appearance, researchers have consistently found that Baudoinia poses no known risk to human or animal health. However, its stubborn nature makes it nearly impossible to permanently remove — as long as ethanol vapors are present, the fungus grows back after cleaning, sometimes within weeks. The fungus became a source of legal and community conflict in 2023 when Tennessee residents near Jack Daniel's warehouses filed lawsuits over its spread, leading a court to temporarily block construction of new aging facilities.
