Paragraph 1 Specification for liquid mineral hydrocarbon

shall be a transparent, almost colourless and tasteless mixture of liquid mineral hydrocarbons;

shall have an ultra-violet extinction (otherwise called absorbance) over the range 240–280 millimicrons not greater than 0.04 for a 1 centimetre layer of a solution in iso-octane containing 1 gram per litre, that is to say, $E\frac{0.1\%}{1cm.}shall\; not\; be\; greater\; than0.04$ where E=log₁₀ (Io/I) and Io and I are the intensities of the incident radiation and of the transmitted radiation respectively; and

shall comply with the tests for acidity or alkalinity, carbonisable substances, solid paraffins, and sulphur compounds given in the monograph for Liquid Paraffin in the British Pharmacopoeia 1963.