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.