Paintings Department: California Mission Painting, 18th Century
Kelsey Fox, Associate Paintings Conservator during treatment
Founded in 1797, Mission San José was once among the largest and most prosperous of California’s 21 missions. Its collection includes histories of Spanish colonial life, Indigenous communities, and the devotional traditions that shaped the mission era. From this collection came a rolled canvas painting of the Virgin Mary or Mater Dolorosa, its age and authorship unknown, and it was carefully stored for years in a cotton drawstring bag while awaiting conservation.
When the painting arrived at our studio, its fragile condition immediately revealed the challenges ahead. Having been stored rolled for an extended period, the canvas exhibited severe planar distortions and pronounced deformations consistent with long-term tension from rail display. Across the surface, extensive paint and ground losses disrupted the composition, particularly through the central figure. Tears and staining further compromised the support, while a thick, yellowed natural-resin varnish had dulled and obscured the original palette.
Treatment began with stabilization. The friable paint film was carefully consolidated to secure lifting and flaking passages before any structural work could proceed. The canvas was then strip-lined to reinforce its weakened edges and temporarily mounted onto a working stretcher. At the same time, a custom mechanical stretcher was fabricated to allow for controlled tensioning during the final mounting process. Following structural preparation, the painting underwent humidification and gradual planar correction. With careful moisture introduced, the distortions from long-term rolling were reduced and the canvas safely restretched onto the custom stretcher. Once the support was stabilized, attention turned to the surface. Solvent testing guided the removal of the oxidized varnish layer along with accumulated surface grime across the passages. As the discolored coating lifted, remnants of the original tonality and modeling reemerged. Next, areas of paint loss were filled to integrate with the surrounding surface, then carefully inpainted to reintegrate. A final varnish layer restored saturation and provided a stable protective coating.
In collaboration with our partners at Sterling Art Services, the painting was framed and prepared for its return. Now structurally secure and visually legible once again, this iconic devotional image returns to Mission San José to be displayed where it has long belonged.
Before Treatment (Left), During First Cleaning (Middle), and After Cleaning (Right)
After Varnishing and Fills (Left), and After In-Painting Treatment (Right)
Overall Front of Painting, Before Treatment
Overall Front of Painting, After Treatment