Abstract: A method is taught for the detection of organosulfur compounds relating to bis-(2-chloroethyl)- sulphide. The detection can be achieved at trace levels or above and is particularly important in the field of environmental, biological and medical analysis.

Abstract: A light modulating material is disclosed, comprising a solid, light transmissive, polymeric matrix having dispersed within said matrix droplets of a liquid crystalline composition, wherein said composition is a mixture of at least 2 compounds, at least one of said compounds having general formula (I), where n is 1 or 2, the fluorine substituent(s) may be in any of the available substitution positions and R.sup.1 is C.sub.1-12 alkynyl, hydrogen, R, RO or RCO where R is alkyl or perfluoroalkyl and at least one other of said compounds having general formula (II), where m is 0 or 1 and R.sup.2 is hydrogen or C.sub.1-12 alkyl or alkoxy.