Picture Restoration Explained: The Methods Used to Restore an Artwork
Most artworks that come in for restoration have not been damaged in a single moment. They have simply lived - through decades of dust, smoke, central heating and sunlight, and the slow yellowing of a varnish applied a century ago. Restoration reverses that decline as far as is safely possible, without altering the artist's hand. Below is an outline of the methods actually used, and why each stage matters.
At Campbell’s of London, our restoration specialists collect the artwork and carry out treatment at their studio. Each piece is carefully assessed and directed to the expert best suited to its material, ensuring the highest standard of care.
Restoration by Type of Artwork
Each medium demands a different set of techniques. Below is what treatment typically involves for the three categories we handle most often.
Oil Painting Restoration
- Surface cleaning: Decades of dust, soot and nicotine lifted gradually with pH-controlled solutions on swabs.
- Varnish removal: Yellowed mastic and dammar varnish removed incrementally under magnification, after solvent testing.
- Consolidation: Lifting or flaking paint secured with a conservation adhesive and set back with controlled warmth.
- Impregnation and lining: A consolidant worked through a brittle canvas to bind weave, ground and paint; a second fabric added to the reverse where the canvas is too weak.
- Tear repair: Tears rejoined thread by thread so the join sits flush rather than being patched over.
- Filling and retouching: Losses filled level, textured to match the brushwork, and retouched in reversible pigments. Original paint is never worked over.
- Revarnishing: A stable synthetic varnish restores depth and forms a protective, removable barrier.
Restoration of Works on Paper
Works on paper—including watercolours, prints, drawings, and photographs—are particularly sensitive and require a different approach.
Common concerns include staining, foxing, tears, and damage from poor mounting or adhesives. Through our network of specialists, we ensure these pieces are treated using conservation-led methods that prioritise long-term stability.
Restoration of Small Sculptural Objects
We also advise on the restoration of small sculptural and decorative objects.
Because materials vary—from plaster and ceramic to wood and mixed media—each piece is reviewed carefully. Where appropriate, we work with trusted specialists to provide the most suitable restoration approach.
The same principles in three dimensions: consolidation, cleaning suited to the material, adhesive repair of breaks, and filling and toning of losses.
The Importance of a Proper Assessment
No treatment is decided at a glance. An artwork is examined in raking light and, where useful, under ultraviolet light, which reveals earlier retouching and the extent of the varnish layer.
At Campbell’s, every piece is reviewed before any work is discussed. This allows us to consider:
- The materials and age of the artwork
- The extent and type of damage
- Any previous restoration
- The overall stability of the piece
- The most appropriate course of action
This process ensures that expectations are clear and that any treatment is both necessary and carefully considered.
A Clear and Controlled Restoration Process
Every stage of treatment is documented and explained in clear terms before it is carried out.
We act as a point of contact throughout the process, ensuring that clients understand what is being done and why. This includes cleaning, repair, stabilisation, and, where appropriate, visual reintegration.
The emphasis is always on control, precision, and respect for the original work.
Framing as Part of the Restoration Process
At Campbell’s of London, restoration and framing are closely linked.
Once an artwork has been restored, appropriate framing plays a critical role in its long-term protection. We provide conservation framing solutions designed to support and preserve the piece.
For works on paper, this may include museum-grade mounts and UV-protective glazing. For paintings, it may involve structural support, backing, and suitable framing that complements and protects the artwork.
Understanding the Cost of Restoration
The cost of restoration will vary depending on:
- The type and severity of damage
- The size and condition of the artwork
- The materials involved
At Campbell’s, we ensure that all work is assessed before any estimate is provided. This avoids uncertainty and ensures that the recommended treatment is appropriate.
Why Work with Campbell's of London?
Campbell's offers a structured and experienced approach to restoration, backed by sixty years of handling artwork in South Kensington.
- Access to trusted specialists across multiple disciplines
- Careful assessment before any work is undertaken
- Clear, professional guidance throughout the process
- Integration of restoration with conservation framing
We focus on ensuring each piece receives the level of care it requires, without compromise.
Final Thoughts
At Campbell’s of London, our role is to guide that process—ensuring your artwork is treated with the care, expertise, and attention it deserves.
