| http://www.w3.org/ns/prov#value | - Suitable alkyl aryl sulphonates for use herein include water-soluble salts or acids of the formula RSO3M wherein R is an aryl, preferably a benzyl, substituted by a C6-C20 linear or branched saturated or unsaturated alkyl group, preferably a C12-C16 alkyl group and more preferably a C10-C14 alkyl group, and M is H or a cation, e.g., an alkali metal cation (e.g., sodium, potassium, lithium, calcium
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