Ecological and Regulatory Colour Fastness Standards

Ecological and regulatory colour fastness standards integrate chemical safety, restricted substance testing, and minimum fastness performance requirements into certification frameworks — including OEKO-TEX Standard 100, bluesign, GOTS (Global Organic Textile Standard), EU REACH regulation, and national restricted substance lists (RSL) from major retail brands. OEKO-TEX Standard 100 colour fastness requirements (Test Report Category I baby products, II direct skin contact, III non-direct skin, IV decoration): Category I (most stringent) washing fastness ISO 105-C06 ≥ 4 colour change, ≥ 3-4 staining; perspiration ≥ 3-4/3; rubbing dry ≥ 4, wet ≥ 3; light fastness ≥ 4. REACH Regulation (EU, No 1907/2006) restricts harmful azo dyes that may cleave to release 22 carcinogenic aromatic amines (4-aminobiphenyl, benzidine, p-chloroaniline and others — limit 30 mg/kg per EN ISO 14362-1 test): azo dye testing required for all textile products marketed in EU. Restricted Substance Lists (RSL): H&M RSL, Primark RSL, Inditex ZDHC RSL each specify maximum limits for 200–500 chemical substances including restricted dyes (disperse dye allergens — Disperse Orange 3, Disperse Yellow 3, Disperse Red 1 restricted to <50 mg/kg per EU Directive 2002/61/EC), heavy metals (antimony, arsenic, cadmium, chromium VI, lead, mercury, nickel — 20 mg/kg OEKO-TEX limit for most), formaldehyde (OEKO-TEX baby products 16 ppm, skin contact 75 ppm, outer layer 300 ppm). pH testing (ISO 3071, fabric aqueous extract, glass electrode pH meter): OEKO-TEX Category I baby products pH 4.0–7.5; Category II skin contact 4.0–8.0 — outside range indicates excessive alkali (scouring not neutralised) or acid (inadequate buffering in dyeing).