Why was Roman wine poisonous?

Why was Roman wine poisonous? In ancient Rome, the upper class favored wine sweetened with sapa, a syrup made by boiling down grape juice in leaded vessels. When heated, toxins leached into the syrup, which was then combined with fermented juice to tame unpleasant tannins and bacteria, as well as act as a preservative.

In ancient Rome, the upper class favored wine sweetened with sapa, a syrup made by boiling down grape juice in leaded vessels. When heated, toxins leached into the syrup, which was then combined with fermented juice to tame unpleasant tannins and bacteria, as well as act as a preservative.
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