# The Control of Poisons and Explosives Precursors Regulations 2015, Paragraph 2


If the reference is (for example) to a substance or preparation containing 1% of a poison, it means—
(a) in the case of a solid, that one gram of the poison is contained in every 100 grams of the substance or preparation;
(b) in the case of a liquid, that one millilitre of the poison or, if the poison is itself a solid, one gram of the poison, is contained in every 100 millilitres of the substance or preparation,
and this paragraph applies likewise in proportion for any greater or lesser percentage.

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Source: https://www.legislation.gov.uk/uksi/2015/966/schedule/paragraph/2 (the official version)
Page: https://openlegislation.uk/control-of-poisons-and-explosives-precursors-regulations-2015/schedule/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.