Figure 2: (a) Spreading on Whatman filter paper at end of 6 h. (b) Spreading on Whatman filter paper at end of 12 h. (c) Spreading on Whatman filter paper at end of 18 h. (d) Spreading on Whatman filter paper at end of 24 h. (e) Spreading on Whatman filter paper at end of 30 h. (f) Spreading on Whatman filter paper at end of 36 h. (g) Spreading on Whatman filter paper at end of 42 h. (h) Spreading on Whatman filter paper at end of 48 h