Dye concentration (%, o.w.f.) K/S Basic Red 18 Treated fabric Untreated fabric 0.5 0.9 0.04 1.0 1.9 0.1 1.5 2.2 0.2 2.0 2.8 0.3 2.5 3.1 0.3 3.0 3.3 0.3 3.5 3.3 0.3

Table 3: Effect of dye concentration on the colour strength of enzyme-treated as well as untreated polyester fabrics dyed with basic dye (Treatment conditions: L.R. 1:40, enzyme concentration 1% (o.w.f.), treatment time 60 min at 40°C, pH 8). Dyeing condition: 30 dyeing time, pH 5 at the boiling; the liquor ratio is 1:100.