Photo shows a strip of white thin layer chromatography (TLC) paper on a glass beaker. A line of colored dots (green, blue, pink, orange, yellow) on the paper shows the separation of colored ink from the chromatography process.
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.
A fantastic lab activity to use when teaching about mixtures, separation techniques, and/or polar and non-polar molecules. Completely editable and easy to adapt to your needs! Your students will love this activity!