# The Preservatives in Food Regulations 1989, Paragraph 3: Reagents


The following reagents shall be used–
(a) cyclohexane (analytical reagent grade);
(b) dicholoromethane (analytical reagent grade);
(c) hydrochloric acid 25 per centum (weight/volume);
(d) silica gel GF 254 (Merck or equivalent);
(e) 0.5 per centum (weight/volume) solution of 2,4,7-trinitrofluorenone (TNF) (Fluka, BDH or equivalent) in acetone;
(f) 0.1 per centum (weight/volume) solution of 2,6-dibromo—p-benzoquinone-chlorimine in ethanol (stable for up to one week if kept in the refrigerator);
(g) concentrated solution of ammonia, specific gravity: 0.9;
(h) standard 1 per centum (weight/volume) solution of pure biphenyl in cyclohexane;
(j) standard 1 per centum (weight/volume) solution of pure 2-hydroxybiphenyl in cyclohexane.

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Source: https://www.legislation.gov.uk/uksi/1989/533/schedule/5/part/I/paragraph/3 (the official version)
Page: https://openlegislation.uk/preservatives-in-food-regulations-1989/schedule-5/part-I/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.