the question is does the rate of diffusion correspond with the molecular weight of the dye?

the question is does the rate of diffusion correspond with the molecular weight of the dye? I answered no the rate of the diffusion was faster in the red dye. the red dye molecular weight was lower then the blue dye but it stopped diffusing quicker then the red dye. is that correct. this is from BIO-Diffusion lab 6 both red and blue dye were dropped in corn syrup,