Non-limiting examples of organic solvents that may be mentioned include C1-C4 alkanols, such as ethanol and isopropanol; polyols and polyol ethers, for instance 2-butoxyethanol, propylene glycol, propylene glycol monomethyl ether, diethylene glycol monoethyl and monomethyl ether, and aromatic alcohols, for instance benzyl alcohol or phenoxyethanol, and mixtures thereof.