SpectraFix Degas Pastel Fixative is a natural, milk casein pastel fixative. This pastel fixative holds pastels without changing their colors and is safe for both indoor and outdoor use. Dries to a matte finish, workable and allows for deep layering. Degas Pastel Fixative is the eco-friendly, non-yellowing choice that protects not only your artwork but your health as well.