Protection of Pastel Artworks
Pastels can be used to produce a permanent work of art if the artist meets appropriate archival considerations. This means:
- Use only pastels with lightfast pigments. Pastels which have used pigments which change color or tone when exposed to light have suffered the same problems as can be seen in some oil paintings using the same pigment.
- Works are done on an acid free archival quality support. Historically some works have been executed on supports which are now extremely fragile and the support rather than the pigment needs to be protected under glass and away from light
- Works are properly mounted and framed under glass in a way which means that the glass does not touch the artwork. This avoids the deterioration which is associated with environmental hazards such as air quality, humidity, mildew problems associated with condensation and smudging.
- Some artists protect their finished pieces by spraying them with a fixative. A pastel fixative is an aerosol varnish which can be used to help stabilize the small charcoal or pastel particles on a painting or drawing. It cannot prevent smearing entirely without dulling and darkening the bright and fresh colors of pastels. It is also toxic, therefore it requires careful use. The use of hairspray as a fixative is generally not recommended as it is not acid free and therefore can degrade the artwork in the long term.
- SpectraFix, a modern casein fixative available premixed in a pump misting bottle or as concentrate to mix with vodka or other high proof drinking alcohol, is not toxic and does not darken or dull pastel colors. However, SpectraFix takes some practice to use because it's applied with a pump misting bottle instead of an aerosol spray can. It's easy to use too much SpectraFix and leave puddles of liquid that may dissolve passages of color, also it takes a little longer to dry than conventional spray fixatives between light layers.
For these reasons, some pastelists avoid its use except in cases where the pastel has been overworked so much that the surface will no longer hold any more pastel. The fixative will restore the "tooth" and more pastel can be applied on top. It is the tooth of the painting surface that holds the pastels, not a fixative. Abrasive supports avoid or minimize the need to apply further fixative in this way.
Glassine (paper) is used by artists to protect artwork which is being stored or transported. Some good quality books of pastel papers also include glassine to separate pages.
Read more about this topic: Pastel
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