The effects of addition of neutral salts on the cholesteric mesophase structure and optical properties of aqueous solutions of hydroxypropyl cellulose (HPC) were investigated by spectrophotometry and an NMR technique with D 2 O as solvent. In the measurements of selective light-reflection spectra, the wavelength of maximal reflectance and therefore the cholesteric helical pitch (P), too, varied systematically with a change in strength of a socalled "chaotropic" effect of the additive salts; i.e., their effectiveness in increasing P was pronounced in the order of Cl −

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