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.