Division 36 Colour fastness to perspiration (acid, alkaline)
United Kingdom
The colour fastness to perspiration (acid and alkaline) shall be at least level 3 to 4 (colour change and staining).
A level of 3 is nevertheless allowed when fabrics are both dark coloured (standard depth > 1/1) and made of regenerated wool or more than 20 % silk.
This criterion does not apply to white products, to products that are neither dyed nor printed, to furniture fabrics, curtains or similar textiles intended for interior decoration.