The amount of dye uptake by dyed and mordanted yarns was
articulated as % of dye absorption. The maximum dye absorption
observed in case of dyed yarns using ferrous sulphate as mordant
followed by copper sulphate at 5% concentration of different dye
extracts. The difference in absorption ratewas because of difference
in interaction between yarnemordantedyes. The colour strength
(K/S) values enhanced with increase in dye absorbance and the
mordant used (Table 3). It observed that the K/S values were found
to maximum using CuSO4 and FeSO4 as mordant. Similarly, the K/S
value of the unmordanted cotton yarns is low, which could be due
to the weak interaction force between the dye and the cotton yarn.
The colour strength increased when the mordant has applied to
treated yarn due to strong interactive force between the treated
yarn and the mordant. Therefore, the colour strength has a direct
correlation with the dye absorbance and metal salts used as
mordant. The results are at par with previous studies