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Home | Category: Canning -- Pickled and Fermented Foods Canning -- Pickled and Fermented FoodsWhat is bluestone?Rating: 100 Bluestone (copper sulfate) is also called blue vitro. It was used in pickling years ago to impart a bright green color to the pickled cucumbers. The copper reacted with chlorophyll to form a blue-green pigment. Because high levels of copper are toxic, the addition of copper to any product is not recommended.
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