Varnish vs Unvarnished: Conservation and Cleaning Considerations for Artists

Varnish vs Unvarnished: Understanding the Surface Choice

This article examines the crucial decision artists face when choosing between a varnish vs unvarnished surface. That choice carries both aesthetic implications and long-term conservation consequences. Varnish has traditionally served as a protective layer and an optical modifier while omitting it may lead to problems—particularly during cleaning and preservation. Recent conservation studies reveal how the misunderstanding or absence of varnish can complicate long-term maintenance, underscoring the importance of this decision for contemporary painters who work in historical styles or materials.

Two recent studies provide valuable insight. Barbara Dragan’s article on cleaning “unvarnished” paintings addresses the misidentification of thin or degraded varnish layers and the challenges they pose (Dragan, 2017). In contrast, a Yale University Art Gallery bulletin examines varnishing as an artistic decision, documenting how modern painters such as Monet, Hopper, and Braque navigated the issue of varnishing (Yale University Art Gallery, 2010).

Historical Perspectives on Varnish vs Unvarnished Paintings

In earlier painting traditions, especially during the Baroque period, varnish was an integral part. It unified surface gloss, increased chromatic depth, and provided a renewable layer. Artists expected future hands to maintain or renew this coating. However, by the late 19th century, many painters—particularly the Impressionists and early Modernists—began to reject varnish.

Claude Monet, for example, came to prefer an unvarnished surface. His painting The Artist’s Garden at Giverny retains its natural matte finish, with no final varnish layer applied. This allows the viewer to see variations in gloss among different brushstrokes, preserving the artist’s intent (Yale University Art Gallery, 2010, p. 123).

Pablo Picasso and Georges Braque were even more assertive. They insisted that their Cubist paintings never be varnished, opting instead to control surface gloss through their choice of painting materials and mediums alone (Yale University Art Gallery, 2010, p. 123).

Edward Hopper took a different route. In his painting Sunlight in a Cafeteria (1958), Hopper selectively applied varnish to enhance areas of translucency, using a retouch varnish on the green walls and windows. This selective saturation changed the gloss locally, supporting specific visual effects (Yale University Art Gallery, 2010, pp. 124–125). With time, however, some of these varnished areas yellowed. The once-subtle effects became more visually dominant, obscuring Hopper’s intentions.