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If I add cooked grape juice to vinegar, does the juice undergo fermentation and also change to vinegar? Are there other conditions like exposure to air? How long would such a process roughly take?

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    $\begingroup$ Fermentation is what creates alcohols and vinegar from the sugars in grape juice. Just adding grape juice to vinegar won't cause fermentation. You need to look up the correct conditions for fermentation (which requires the right concentration of sugar and yeast). Try a wine-making manual. $\endgroup$ – matt_black May 28 '16 at 11:28
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The process that transforms sugars (e.g. the ones in grape juice) into ethyl alcohol and then this latter into acetic acid is a biological one, that is, performed by micro-organisms. The first step is usually performed by yeasts such as Saccharomyces Cerevisiae, whereas the second step is performed by bacteria of the Acetobacter genus. Thus, your grape juice won't change to vinegar if you mix both liquids. All you will get is a sweeter vinegar, or a sour grape juice.

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