Optical images of isolated crystals show clearly the colors associated with the homogeneously distributed dyes. Polarized light measurements show that some of these different dyes are aligned inside the channels (Figure ), and this effect is dependent on the concentration of the dyes (Figure ). Optical images of crystals saturated with dyes recorded at different angular directions show moderate or minor color changes for the small and medium sized molecules (Group I and II). Interestingly, crystals loaded with lower amounts of one of the smaller dyes i.e., sodium resorufin, do show clear changes in the intensity of the purple color (Figure ). We postulate that this change in coloration intensity is a result of different organization of sodium resorufin in the two different channels. The smaller channel is more likely to restrict the number of possible orientations resulting in an aligned array of molecules whose absorption is dependent on the incident angle of the polarized light. In contrast, the same dyes inside the larger channels are less ordered as their absorption is less affected by the use of polarized light.