# 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.

Identification is done by thin layer chromatography on silica gel. Detection of quinine is by the blue fluorescence of quinine in acidic conditions at 360 nm.
For further confirmation, the fluorescence can be eliminated by bromine vapours, and ammonia vapours will cause a yellowish fluorescence to appear.

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Source: https://www.legislation.gov.uk/eudr/1985/490/annex/division/3/division/A/division/2 (the official version)
Page: https://openlegislation.uk/eu-directive-1985-490/annex/division-3/division-A/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.