# Commission Directive 2004/73/EC of 29 April 2004 adapting to technical progress for the twenty-ninth time Council Directive 67/548/EEC on the approximation of the laws, regulations and administrative provisions relating to the classification, packaging and labelling of dangerous substances (Text with EEA relevance), Division 1.3: REFERENCE SUBSTANCE

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

65% (w/w) aqueous nitric acid (analytical grade) is required as a reference substance.
Optionally, if the experimenter foresees that the results of this test may eventually be used for other purposes, testing of additional reference substances may also be appropriate.

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Source: https://www.legislation.gov.uk/eudr/2004/73/annex/n2/division/A.21/division/1/division/1.3 (the official version)
Page: https://openlegislation.uk/eu-directive-2004-73/annex-n2/division-A.21/division-1/division-1.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.