Whiteness index, Yellowness index and K/S value Whiteness index (Hunter) and Yellowness index (ASTM) of the undyed enzyme treated and undyed control samples were estimated by exposing the samples in JAYPAK 4802 Colour matching system (of Jay Instruments Ltd, Mumbai) at D65 illuminate/ 10 Deg Observer with duplicate measurements as per standard AATCC 153-1985 (7).