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- Iron - Copper - Zinc - Manganese
Iron is naturally occurring and may be increased in wine or grape juice through contact with iron containing metals. Excessive iron may result in instability.Copper may be introduced to wine through the addition of copper sulfate or through contact with copper metal. Zinc is a micro nutrient found in all plants and thus also in the wine. Manganese is naturally found in grapes due to uptake from soil, and is used by grape vines as a nutrient. Certain countries impose limits on Manganese concentration.