A few notes: Clarke's TB is a useful solvent system for drugs that you should know. It is 75:15:10 Cyclohexane:Toluene:Diethylamide. Also, you do not necessarily need to spray down the plate with NaOH prior to use if you find that you get adequate results with an unsprayed plate. Finally, DO NOT try to submerge large plates into Marquis. This can make a dangerous mess.