Colour Fastness to Artificial Perspiration
topic
Perspiration fastness testing sandwiches dyed fabric specimens between adjacent undyed cotton and wool fabrics in a perspiration solution of defined composition at pH 5.5 and 8.0, pressing specimens under 12.5 kilopascal load at 37 degrees Celsius for four hours, then grading colour change of the specimen and staining of adjacent fabrics against grey scale standards.
Role
Simulates dye transfer from textiles to skin and adjacent fabrics under sweating conditions, providing the acid and alkaline perspiration fastness grades that determine acceptability of dyed textiles for direct skin contact in OEKO-TEX certification and international buyer specification frameworks.