You should not use copper vessels for storing pickled foods or for pickling foods. In addition, drinking water should not be stored in copper vessels. Do not keep milk and milk products like cream, butter, etc. in copper vessels as it could react with the metal and cause illness. The same goes for honey, citrus juice and yogurt, as they have acidic properties that could react with the metal. Copper utensils also should not be used to eat, drink and serve these foods. If a copper utensil is left standing in dairy or acidic foods, the food should be discarded to avoid health problems."
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