I don't know how "authentic" or how "bogus" this notion might be, but I heard once that nonfat milk, when applied to the surface of a pastel drawing via atomizer, would "fix" the surface of the work in a safer, less toxic manner than when chemical/aerosol sprays are used. I assumed (if this were indeed a useful technique) that the absence of butterfat was CRITICAL, and that the working agent in this method would be the milk's casein content. Of course, I would never try it on MY pastels!!! ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ "Learning is not attained by chance. It must be sought with ardor and attended to with diligence." --Abigail Adams Anita Mills [log in to unmask] Public Relations Specialist Office of University Development Duke University 1 (919) 684-2123 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^