What is the relation between rf value to the molecular size of the pigment?

The Rf value (retention factor) in chromatography is inversely related to the molecular size of the pigment. Smaller molecules typically travel farther up the chromatography medium, resulting in higher Rf values, while larger molecules move more slowly and have lower Rf values. This is because larger pigments may experience more resistance and interactions with the stationary phase. Therefore, by analyzing Rf values, one can infer the relative sizes of different pigments in a mixture.