# The Hydrocarbon Oil (Marking and Designated Markers) (Amendment) Regulations 2023, Regulation 5: Amendment of the Hydrocarbon Oil (Marking) Regulations 2002


(1) Paragraph (1) of regulation 2 (interpretation) is amended as follows.
(2) Omit the definition of “Colour Index”.
(3) Omit the definition of “the common fiscal marker”.
(4) For the definition of “coumarin” substitute—
““coumarin” means 1,2-benzopyrone”.
(5) In the appropriate places insert—
““the general marker” means N-Ethyl-N-[2-(1-isobutoxyethoxy)ethyl]-4-(phenylazo)aniline;”;
““solvent orange” means 1-[(2-methylphenyl)azo]-2-naphthol;”.
(6) For the definition of “solvent red” substitute—
““solvent red” means a dye that consists of at least 50% 1-(2-methyl-4-(2-methylphenylazo)phenylazo)-2-naphthol, with any remainder consisting of one or more of—
(a) 1-(4-(phenylazo)phenylazo)-2-naphthol;
(b) 1-[[3-methyl-4-[(3-methylphenyl)azo]phenyl]azo]-2-naphthol;
(c) 1-[[2,5-dimethyl-4-[(2-methylphenyl)azo]phenyl]azo]-2-naphthol;
(d) 1-[[4-[(dimethylphenyl)azo]dimethylphenyl]azo]-2-naphthol.”.

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Source: https://www.legislation.gov.uk/uksi/2023/1187/regulation/5 (the official version)
Page: https://openlegislation.uk/hydrocarbon-oil-marking-and-designated-markers-amendment-regulations-2023/regulation-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.