The Member States shall take all necessary steps to ensure that the provisions laid down — both in Annex I to this Directive and in Annex I to the Directive referred to in Article 2 — be applied in official tests, to determine the composition of textile products composed of a ternary fibre mixture put on the market in accordance with the Council Directive of 26 July 1971 on the approximation of the laws of the Member States relating to textile names.