{
  "url": "https://openlegislation.uk/eu-directive-1983-514/annex/division-14/division-4/division-4.2/division-4.2.3/division-4.2.3.4",
  "json_url": "https://openlegislation.uk/eu-directive-1983-514/annex/division-14/division-4/division-4.2/division-4.2.3/division-4.2.3.4.json",
  "legislation": "eudr/1983/514",
  "legislation_title": "Third Commission Directive of 27 September 1983 on the approximation of the laws of the Member States relating to methods of analysis necessary for checking the composition of cosmetic products (83/514/EEC)",
  "legislation_url": "https://openlegislation.uk/eu-directive-1983-514",
  "path": "annex/division/14/division/4/division/4.2/division/4.2.3/division/4.2.3.4",
  "kind": "division",
  "number": "4.2.3.4",
  "heading": "Interpretation",
  "text": "Compare the Rf values and the colour of the reference solutions with those of the standards. The mean Rf values given below as a rough guide have only a comparative value. They depend upon:\nthe state of activation of the thin layer at the time of chromatographing,\nthe temperature of the chromatography tank.\nExamples of Rf values obtained on a silica gel layer\nEluting solvents\n4.2.1.16.1\n4.2.1.16.2\nMercaptoacetic acid\n0,25\n0,80\n2-mercaptopropionic acid\n0,40\n0,95\n2,2'-dithiodi(acetic) acid\n0,00\n0,35\n3-mercaptopropionic acid\n0,45\n0,95\n3-mercaptopropane-1,2 diol\n0,45\n0,35",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eudr/1983/514/annex/division/14/division/4/division/4.2/division/4.2.3/division/4.2.3.4",
    "retrieved_at": "2026-11-01T15:23:36.810601+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}