These vinegars are obtained from unfiltered red wine or unfiltered apple juice.
Mengazzoli's characteristic attention to the careful selection of ingredients and the careful manufacturing process that controls the fermentation, allow it to not filter and to avoid heat treatment of these products. In this way they preserve La Madre dell'Aceto - the Mother of the Vinegar, which is generally filtered out of regular vinegar.
Here the vinegar is 'raw,' preserving the Mother in the bottle. It appears as a natural sediment and a slightly cloudy appearance to the vinegar. It also adds a richness and depth to the flavor. Some people also believe that the Mother is responsible for most of the good health benefits of these vinegars.