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In page Plastic:

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Controversies associated with plastics often relate to their additives, some of which are potentially harmful.[1][2][3] For example, some flame retardants, such as octabromodiphenyl ether and pentabromodiphenyl ether, are unsuitable for food packaging. Other harmful additives include cadmium, chromium, lead and mercury (regulated under the Minamata Convention on Mercury), which have previously been used in plastic production, are banned in many jurisdictions. However, they are still routinely found in some plastic packaging, including for food.[citation needed]