2.5. Evaluationofcolorstrength colorfastnessandphysical properties,,To evaluate dyeing performance the color, strength (K / S) and CIELAB of the dyed samples were measured using a Hunter Lab. Color Quest XE spectrophotometer with illuminant D65 and 10 cream observer. The K / S is calculated by the Kubelka - Munk, equation. K / S = (1 − R), 2 / 2R where R is the reflectance K is, the absorption coef - ficient and S, is the scattering, coefficient. The color difference is expressed as E * and is calculated by the following Eq. (1):E ∗.(L ∗) 2 + (a ∗) 2 + (B ∗) 2 (1).Where E * is the CIELAB color difference between batch and standard. Here L *, *, * a B and hence E * are in commensu - rate. Units. L * denotes the difference between lightness (where L * = 100) and darkness (where L * = 0), a * the difference between. Green (− a *) and red (+ A *) and B * the difference between yellow (+ b *) and blue (− b *), (Park 1993). All measured samples showed. A maximum absorption wavelength value (max) at 400 nm. The color fastness to washing light crocking,,,,, perspiration and Water of the dyed samples were determined according to AATCC Test, Method 61-2010 ISO 105-B02: 1994 AATCC Test Method 8-2007 AATCC,,,
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