Pen ink consists of a mixture of dyes that can dissolve in the solvent and contaminate the chromatogram.
Pencil lead is usually made of insoluble graphite, which made it suitable for drawing the start line in paper chromatography.
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Pen ink consists of a mixture of dyes that can dissolve in the solvent and contaminate the chromatogram.
Pencil lead is usually made of insoluble graphite, which made it suitable for drawing the start line in paper chromatography.