a student is asked to analyze a sample of black ink to see which does it contain
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Explanation:
chromatography
When the water passes through the black ink it takes the pigment colors with it. Some pigments dissolve in water easier and are pulled with the water farther up the paper. This is called chromatography - separating the parts of a mixture so that you can see them one at a time. Black ink actually looks like a rainbow!
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