Why did the 30:70 hexane/ethyl acetate solvent ratio give the best separation of pigments in spinach? Why do you think this was the case? Do you think you could improve the separation by making...

Why did the 30:70 hexane/ethyl acetate solvent ratio give the best separation of pigments in spinach? Why do you think this was the case? Do you think you could improve the separation by making another ratio? If so, what would you try first?