| http://www.w3.org/ns/prov#value | - A composition according to claim 1, comprising a) At least one compound (I), wherein R, is a substituent selected from the group consisting of C1C18alkyl, C3C18alkyl interrupted by O, phenyl and benzyl ; R2 and R3 are hydrogen; X is carboxy and Y is ammonium, (C1C4alkyl)14ammonium or (2hydroxyethyl)14 ammonium; or X is carboxylate or derivatised carboxy selected from the group consisting of cyano,
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