# The Preservatives in Food Regulations 1989, Part III: General Purity Criteria Applicable to Permitted Preservatives except where otherwise provided by Specific Purity Criteria


Each preservative shall not contain–
(a) more than 3 milligrams per kilogram of arsenic;
(b) more than 10 milligrams per kilogram of lead;
(c) more than 50 milligrams per kilogram of copper, or 25 milligrams per kilogram of zinc, or 50 milligrams per kilogram of any combination of copper and zinc.

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Source: https://www.legislation.gov.uk/uksi/1989/533/schedule/1/part/III (the official version)
Page: https://openlegislation.uk/preservatives-in-food-regulations-1989/schedule-1/part-III
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.