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Mark, reasonable amounts of Campden tablets, or other forms of sulfur dioxide, will _not_ kill native yeast. The native yeast will only be stunted and inactive for a few hours. On the other hand, commercial wine yeasts are _not_ sensitive to reasonable amounts of sulfur dioxide, so yeast manufacturers recommend adding their yeasts immediately after adding sulfur dioxide. That way, the commercial yeast can multiply (and dominate the fermentation) for the few hours the native yeasts are stunted by the sulfur dioxide.
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