For the above procedures, the solvents include organic solvents such as methylene chloride, ethylene dichloride, trichlorobenzene, dioxan, isophorone, tetrahydrofuran, aromatic and chlorinated hydrocarbons, mixed solvents such as 50/50 ethylene dichloride/diacetone alcohol; 40/60 alcohol/toluene; 30/70 alcohol/carbon tetrachloride, and the like.