Possible examples are organic and/or inorganic materials, such as ammonium salts, aliphatic alcohols of the empirical formula Cn H2n+2 O, aliphatic dihydroxy, trihydroxy and polyhydroxy compounds, aliphatic carboxylic acids of the empirical formula Cn H2n O2 (also in the form of their salts, esters and other derivatives), aliphatic dicarboxylic acids of the empirical formula Cn H2n-2 O4, higher al