# Fourth Commission Directive of 11 October 1985 on the approximation of the laws of the Member States relating to methods of analysis necessary for checking the composition of cosmetic products (85/490/EEC), Division 2: PRINCIPLE

Extent: E+W+S+N.I.

After acidification of the sample, sulphur dioxide liberated is distilled into a solution of hydrogen peroxide. Sulphuric acid formed is titrated against a standardized sodium hydroxide solution.

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Source: https://www.legislation.gov.uk/eudr/1985/490/annex/division/IDENTIFICATION/division/B/division/2 (the official version)
Page: https://openlegislation.uk/eu-directive-1985-490/annex/division-IDENTIFICATION/division-B/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.