A gelatinous, cloudy substance, integral to raw, unfiltered apple cider vinegar, is composed of a complex structure of cellulose and acetic acid bacteria. This symbiotic culture of bacteria and yeast is responsible for converting alcohol into acetic acid during the fermentation process. It visually manifests as sediment at the bottom of the vinegar bottle, or may appear as a murky film floating within the liquid.
Its presence indicates a living, unpasteurized product, offering potential probiotic benefits due to the bacteria involved in its formation. Historically, vinegar production relied on this natural occurrence; modern pasteurization often removes these beneficial components for clarity and shelf stability. Retaining this component allows for continued fermentation and potentially enhanced health properties associated with live cultures.