Form Liquid Material Apple Cider Vinegar Packaging Size Half liter, 20 liter Color Yellowish Packaging Type Bottles Usage/Application Industrial The fermentation processSecondly, good bacteria are added, which helps to convert the alcohol into acetic acid. thick, gelatinous layer is formed by the acetic acid bacteria on the surface of the vinegar. This layer is known as 'The Mother' because it is the catalyst that gives rise to the vinegar.