The origin of the contamination of copper could be innocent and dangerous tip of a popular cookbook

The origin of the contamination of copper could be innocent and dangerous tip of a popular cookbooks of the time, suggesting the use of a small copper coin during cooking or else the rest of the product for a few hours in a bronze container or brass (copper-containing alloys). As could also be intentionally contaminated with copper addition salts or metal containers of this in baking to obtain the desired green color in canned vegetables.
References at the time indicate that the tests to detect copper in canned could use ammonia, which reveal the bluish color of the solution the presence of copper in quantities not suitable for consumption, and then in extreme cases the test could be done even with a metallic needle (iron) immersed in the preserve, which after a few hours would be coated with a layer of copper appearance. eating moldy food Such a layer would occur due to reduction eating moldy food of copper ions present in solution and subsequent deposit of the metal on the surface of the needle.
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