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The diagram shows the results of an experiment to separate and identify the colors present in two colored mixtures, A and B. Substances C, D, E and F are single colors.

(a) Name this method of separation.
(b) Why should a pencil be used instead of a pen to draw the origin line?

Answer Text:
a).This method is known as paper chromatography.
b).A pen ink is has color pigments which can affect the accuracy of the expected results.