Fix charcoal and pastel works.
Daler-Rowney Perfix Colourless Fixative is an excellent quality fixative spray that fixes charcoal and pastels. It sprays evenly with a minimal effect on tonal values and is easy to use. To achieve the best result, artists need lay their drawing flat and holding the can about 30cm away, spray back and forth across the drawing ensuring even coverage over the surface.
Daler-Rowney Pastel Fixative dries quickly to prevent smudging and, once dry, it's completely colourless so artists can continue working on top of it.