Use of dibenzoylmethane derivatives (I) for increasing or achieving the solubility of 4,4',4''-(1,3,5-triazin-2,4,6-triyl-triimino)-tris-benzoic acid tris-(2-ethylhexyl)ester (II) in either a single oil or one or more oil phases in a two or more component system is new. Also claimed is the stabilisation of solutions of (II) by the addition of (I).
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