There is no limitation, but concrete examples would be: aromatic compounds such as toluene and xylene; alcohols such as ethanol, isopropyl alcohol and butyl alcohol; ketones such as acetone, methylisobutyl ketone and methylethyl ketone; esters such as ethyl acetate and ethyl butyrate; petroleum compounds such as petroleum naphtha and mineral spirits; and cellosolve, carbitol, etc.