Precipitated Chalk (E170) - 50g
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Precipitated Chalk (E170) can be used to reduce the acidity in homebrew wines.
If you're making wine at home and it becomes too acidic whilst fermenting then you can add some precipitated chalk to raise the pH level.
When used precipitated chalk will cause the homebrew liquid to foam as there is a gas given off by the chalk as it neutralises some of the acid in the wine.
Make sure there is enough room in the vessel to account for the raise in level of the foam. You may need to take some liquid out if you don't have enough room.