when you talk about alternatives for SO2, you need to discuss them also in the context of wine style and quality, as this is certainly impacted by moving away from SO2. You should do a bit more research for confirming or contradicting research within a method you write about, as you tend to focus on only reference per theme. You could also include packaging and bottling as source of Oxygen, screw caps for example are a very good option to bottle low SO2 wines
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