Without prejudice to the tolerances laid down in Article 4(2), Article 5(3) and Article 6(5), visible, isolable fibres which are purely decorative and do not exceed 7 % of the weight of the finished product need not be mentioned in the fibre compositions provided for in Articles 4 and 6. The same shall apply to fibres, such as metallic fibres, which are incorporated in order to obtain an antistatic effect and which do not exceed 2 % of the weight of the finished product. In the case of the products referred to in Article 6(3), such percentages shall be calculated not on the weight of the fabric but on the weight of the warp and that of the weft separately.