The note is overwhelmingly sharp and acidic, a caustic burst that assaults the nasal passages with immediate recognition. It often begins with a cloying, fermented sweetness reminiscent of overripe fruit or stale alcohol, quickly transforming into a profoundly sour and bile-like pungency. Underlying this is a distinctly stomachic warmth, a heavy, sickly-sweet, and often faintly metallic tang that speaks of internal processes gone awry. Depending on its 'source,' it can carry nuances of whatever was recently consumed – a hint of dairy gone rancid, a yeasty bread-like fermentation, or the sharp, acrid sting of stomach acid alone. Its texture, if one could perceive it olfactorily, feels thick, viscous, and coating, leaving a persistent, clinging residue. Intensity is extreme, with immense projection that permeates any space, and its longevity, particularly on porous surfaces, is disturbingly tenacious, resisting easy eradication. It functions less as a 'note' in the perfumer's palette and more as an olfactory alarm, a stark warning of discomfort and putrefaction. It lacks any pleasant evolution, instead decaying into more intensely foul, ammoniac, and sometimes fecal undertones.