I don't have access to the details about what you are asked to do by the IGCSE, so I couldn't possibly answer your question with "yes" or "no". The Science Buddies Project Ideas also are not recipes for your project: they are ideas and information about science experiments that you can use to formulate your project.
Chromatography is a long-standing, important method for separating and analyzing mixtures of molecules. See http://en.wikipedia.org/wiki/Chromatography
for just a survey of the many forms of chromatography. "Candy Chromatography" suggests a form of chromatography that you can do without great expense and elaborate equipment. The specifics of how you formulate the theme of your project, how you present the results, how you explain them, and how you connect your experiments to vital issues will do far more than just the bare idea to determine how well you are rated.
I suggest you review the IGCSE assignment along side "Candy Chromatography" and see if you can use that idea to build your project satisfactorily.
Please get back to us with any specific questions about the science and technology issues you encounter.
Good luck, WW