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Paragraph 5

Changes not yet applied. Later legislation changes this provision in ways not yet written into the text below:

By way of exception to paragraph 4(a) above, any amount referred to in paragraph 2(c), 3(a) or 3(b) above may be expressed as a percentage by weight, unless the amount is less than 0.1percnt; by weight, in which case it shall be expressed in milligrams per kilogram or micrograms per kilogram as appropriate.