Find the Hidden Colors of Autumn Leaves - What color are autumn leaves really turning?: Use some simple chemistry to separate out molecules that give fall leaves their vibrant colors. Free via Scientific American.
Are all black inks the same? In the "Paper Chromatography: Is Black Ink Really Black?" chemistry science project, students use paper chromatography to analyze the components in permanent black markers. A project kit is available to do this science project! [Source: Science Buddies] http://pinterest.com/sciencebuddies
Use white construction paper or coffee filter strips for this experiment on Separating Mixtures. This can be used to demonstrate primary colors, Chemical Changes (how molecules can be separated and the atoms can then be joined together into a different combination,) and even to show how scientists use a similar technique to separate DNA. Plus, it's just fun!