For example, replace ethylene glycol with another solvent (dioxane, isopropanol); use other emulsifiers (not lecithin); use dimethyl sulfoxide to facilitate sample impregnation; replace the treatment with a solution of chromium trioxide with benzoyl peroxide or something similar; use microwaves; finally, replace linoleic acid with something else (for example, a solution of acrylic acid in different types of solvents) ???