of dyes in Mamp;M’s, why can’t a pen used in step 8? why must the spots of dyes that are placed on the chromatography paper be as small as possible?…

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For chromatography of dyes in M&M’s, why can’t a pen used in step 8? why must the spots of dyes that are placed on the chromatography paper be as small as possible? why shouldn’t the solvent be allowed to reach the top of the sheet of chromatography paper in step 9?

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