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A student carried out a paper chromatography experiment to analyse a sample of a dye, 'Mystery Blue'. They spotted 'Mystery Blue' alongside known pure dyes (A, B, and C) on chromatography paper. The solvent front travelled 9.0 cm. The spot for 'Mystery Blue' travelled 4.5 cm. The spot for dye A travelled 4.5 cm, dye B travelled 7.2 cm, and dye C travelled 2.7 cm. Explain how the results of this chromatogram allow the student to identify the components of 'Mystery Blue' and determine if it is a pure substance. Include any relevant calculations. [6 marks].
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