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Also known as Potassium Sorbate. Added to a wine to stop the fermentation and prevent a re-fermentation after bottling. Should always be used together with Campden Tablets, otherwise wine will get a smell of 'Duranium'.
Add 1 gram (1/2 tsp) per gallon to a glass of warm water or wine. When dissolved add to your vessel and swirl well daily for 2 to 3 days. One crushed Camden Tablet should also be added to the wine at this stage.