Treatments means varied non significantly for purity. The highest value of purity was recorded in T6 (84.54%) followed by T1 (84.26%), T5 (84.15%), T2 (83.72%), T7 (53.54%), T4 (83.24%) and T3 (82.79%). The maximum value of purity in T6 may be due to maximum value of pol in this treatment. Similar studies were also reported by Sarwar et al., (2011).