"Organic compounds are preferred, for example aliphatic alcohols having, for example, 1 to 12 carbon atoms, such as methanol, ethanol, isopropanol, octanol, 2-butanol and ethylene glycol; aromatic alcohols, preferably having 7 to 15 carbon atoms such as benzyl alcohol; phenols, preferably having 6 to 18 carbon atoms such as phenol, cresol and chlorophenol; aliphatic carboxylic acid esters, preferab" . . . .