Sample No. Solvent System 1 Toluene/Benzene (12:8) 2 Toluene/Acetone (16:4) 3 Toluene/Benzene/Cyclohexane (4:12:4) 4 Toluene/Benzene/Diethyl ether (12:6:2)

Table 1: Solvents used.