Discussion
The most suitable solvent system for thin layer chromatography/paper chromatography of inks is
Answer: A
The most suitable solvent system for thin layer or paper chromatography of inks is n-butanol : pyridine : water (3 : 1 : 1.5). The polar mixture separates the dyes of ink well.
The other mixtures, built on amyl alcohol, acetic acid with chloroform or pyridine, and on ethanol with acetone, are listed as less suitable by the key. Mixed solvents like this one work because the polar solvents (butanol, pyridine and water) carry the water-soluble dyes of ballpoint and fountain pen inks at different rates up the plate, so the dyes separate into bands whose colour and distance can be compared between a questioned and a known ink.
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