Place a concentrated dot of ink from a black felt-tip pen at the center of the piece of porous paper. Carefully place one drop of water on top of the dot, and watch the ink spread radially with the solvent. Because the different components of the ink have different affinities for the water (and the paper) they travel with the water at different rates. Just after the drop of water is completely absorbed, add a second drop, then a third, and so on until the ink components have separated to your satisfaction. Try other types of inks.
This technique, called paper chromatography, was originally developed to separate plant pigments from one another. The separated pigments had different colors, which is how this technique got its name—chroma is Latin for “color.” Try the above procedure using spinach extract!
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