A method of preparing a composition, comprising (a) a micronised insoluble organic UV absorber, which method comprises grinding the insoluble organic UV absorber, in coarse particle form, in a grinding apparatus, in the presence of a grinding aid selected from the groups (b1) carboxylic acids and their salts (b2) fatty acid esters (b3) alkyl phosphates or phosphoric acid esters (b4) ethoxylated carboxylic acids or polyethyleneglycol (PEG) esters (b5) fatty alcohol polyethyleneglycol (PEG) ethers of fatty alcohols (b6) polyethylene/polypropylene -glycol ethers of saturated or unsaturated C4-C28 fatty acids (b7) ethoxylated alkylphenols or ethoxylated alkylphenyl ethers (b8) esters of polyol and mono-, di- or tri-glycerides (b9) esters of fatty acids and saccharose (b10) sorbitan mono- and di-esters of saturated and/or unsaturated C6-C22 fatty acids and ethylene oxide groups and (b11) surfactants which are mainly acting as detergent or cleansing agents.
