Yellowing Test Kit

Phenolic yellowing

One of many colour fastness tests, this is a predictive test to assess the potential of white or pastel-coloured yarns, fabrics or garments to yellow (garment yellowing). Our Test Kit is the original, developed by Courtaulds Research, for investigating complaints arising from transit or storage yellowing. Beware of copies and counterfeit products, which do not produce accurate or consistent results or might cause health and safety issues.



Loading our Incubator/Oven with Perspirometers ready to test.



Checking the control fabric to confirm the validity of the test.



Assessing the intensity of yellowing of the tested specimens.


Great Partnerships


Incubator oven for perspirometer tests


Incubator/Oven maintains prescribed test temperature of 50°C.


Grey scales for assessing stain levels


Grey Scale (colour change) to assess the degree of yellowing.



Perspirometer with glass plates and impregnated test papers to sandwich the test specimens.




  • Adidas 5.10

Arcadia Group

  • Arcadia AG16


  • BHS TM 45


  • EN ISO 105-X18


  • M&S C20B


  • Tesco Appendix D and Appendix N

Certificates of Conformity

Free Certificates

Most of our test materials come with free certificates of conformity. Download a real Phenolic Yellowing certificate of conformity to see for yourself. Log in or register an account with us to access all certificates.

Yellowing Kit Conformity Certificate

Test Materials Brochure

Our Test Materials brochure contains in-depth information and specifications about our Test Materials.


Corporate Brochure

Our corporate brochure contains details of our key instruments and other services.


James Heal Testing Catalogue