Mother of Vinegar Like the diamond crystals of fine wines, Mother of Vinegar is an indication of extraordinary calibre in a fruit vinegar. These fibres or gelatinous lumps that form in the bottle are a sign of naturally fermented authentic vinegar. They are harmless and may be disregarded or strained by using a coffee filter.
During the high pressure filtration process fruit and berry particles become suspended. Over a period of time these particles may break down and settle as light sediment in the bottom of the bottle.
Never pickle with fruit vinegar under 5% acetic acid.