Preservatives

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Day 4, one of my batch showing sign fermentation, the other still no reaction.
Here is my experiment:
1 L grape juice ( mistake) with benzoate
1 L blueberry juice without benzoate
1/8 tea spoon of yeast

Reaction at day (not yet)

1 L grape juice ( mistake) with benzoate
1 L grape juice ( mistake) with benzoate
1/8 tea spoon of yeast

Reaction at day 4

Try adding some of the fermenting juice to the non fermenting juice.