While creating a piece of artwork, Lupita becomes curious about the ink she using to create her art. She wonders if the ink is pure substance or a mixture. The ink separates when a chromatography experiment is performed on it , leaving multiple marks of different colors along the chromatography paper. When the ink is left out for twenty four hours, the ink settles into individual components. Using her observations of the properties of the ink, the student can classify it as a ______________________