The 'Blue' phase of cholesterol proprionate.

The claim that the cholesteric liquid crystal "blue" phase (BP) of cholesterol proprionate (CP) is not the same as any of those of cholesterol nonanoate (CN) was tested by studying the phase relations in the CP-CN system. The lowest-temperature BP (BPI) was continuous across the whole diagram, while the BPII disappeared at between 76 and 90wt. % CP. It is therefore deduced that the BP of CP is the same phase as the BPI of CN.