Spectral distributions of selective reflection from liquid crystal layers were investigated as a function of the dipole moment of the chlorinated hydrocarbon molecules used as solvent in casting the film. It was found that the use of non-polar solvents such as CCl4 does not affect the interactions between liquid crystal molecules. As the polarity of the solvent increases, the rotation of the helical arrays are hindered with a resultant decrease in the sensitivity. The solvent molecules remain as an impurity with very low concentrations in liquid crystal films. Their effect is not as great as the effect of an L.C. additive. Yet even at these low concentrations they may change the sensitivity as much as 100%.