Chromatography is a way of seperating a mixture of chemicals such as ink, makeup or food colouring. It can give clues to many crimes.
If someone rights a ransome note, the police might take the note and put the end in water and the ink will seperate into colours then they will take draw dots on another piece of paper with pens the poilice suspect from many suspects they will put that in water aswell, the ink from the pen will seperate so the ink that matches the ink from the ransome note will be the used pen, then the forensic team will take fingerprints from the pen.
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