Did you know that many of the colors in markers are actually mixtures of other colors? You can separate these mixtures by using a process called chromatography. All you need is a coffee filter and a colored marker (black and brown work best).
1. Take your coffee filter and cut a strip about 1/2 inch wide.
2. Put a dot of colored marker 1/2 inch from one end.
3. Lower this edge into water so that the paper touches the water but the dot is above water.
4. Wait (patiently!). The water will climb up the paper and separate the ink into the colors that make it up.
-By Harriet Vender, 7th and 8th grade science teacher