WhatsApp usSome paintings come to us for routine conservation care. Others require a deeper investigation into their materials, history and previous treatment. This remarkable 17th century portrait, attributed to Cornelius Johnson, arrived with all three: artistic significance, a compelling sitter identity and the visible effects of time.
Above: the portrait under assessment in our conservation studio
For generations, it had occupied a prominent position within a historic farmhouse, passing through the hands of successive custodians who recognised its importance and ensured its survival. Along the way it accumulated its own layers of history: old labels identifying the sitter, clues to its provenance, an impressive period frame and evidence of several earlier restoration campaigns. Each told part of the painting’s story.
When the portrait arrived at our studio, however, another story was equally apparent. Centuries of ageing varnish, historic repairs and later interventions had gradually altered how the painting was seen. The sitter remained present, but the subtlety of the artist’s work had become increasingly difficult to appreciate beneath layers of discolouration and overpaint.
As conservators, our task was not simply to clean the painting. It was to understand its history, preserve the evidence of its journey and carefully recover the qualities that had made it worthy of preservation for more than four hundred years.
Above: the portrait upon arrival in our studio, ready for a condition assessmentÂ
An Age of Merchants, Ambition and Legacy
During the reigns of James I and Charles I, Cornelius Johnson painted at a time when England was being transformed by growing international trade, expanding colonial ventures and the increasing influence of London’s merchant classes.
Wealth and social status were no longer the preserve of the aristocracy alone. Successful merchants, professionals and landowners were becoming influential figures in their own right, eager to record their achievements and establish lasting family legacies.
Above: a view of London in the mid 17th Century
The sitter in this portrait is believed to be George Clarke (c.1600–1668), listed in records as a ‘Citizen and Merchant Taylor of London’. Being a member of one of the capital’s most prestigious livery companies, Clarke belonged to a rising commercial class that helped drive England’s prosperity during the early Stuart period. Men like Clarke occupied an increasingly important position in society: connected through trade, civic life and family networks, yet distinct from the traditional landed nobility.
It was precisely these individuals and families who formed the core of Johnson’s clientele. By the 1620s he had established himself as one of London’s leading portrait painters, known for creating refined and highly personal likenesses that balanced social status with careful observation.
This portrait reflects many of the qualities for which Johnson is admired today. Rather than the theatrical grandeur later associated with Anthony van Dyck, Johnson favoured restraint and intimacy. His sitters are presented with quiet confidence, their individuality conveyed through subtle expression, meticulous attention to costume and a remarkable sense of presence.
Above: a detail of the portrait’s surface before restorationÂ
The painted oval surround is particularly characteristic of Johnson’s work. Designed to create the illusion of looking through a framed opening, it draws the viewer directly towards the sitter and reinforces the sense of personal encounter. It is a sophisticated device that appears in many of his most recognisable portraits and remains one of the artist’s defining visual signatures.
More than four centuries after it was painted, the portrait remains a rare and tangible connection to the commercial, cultural and social world of early Stuart England.
Above: a pair of portraits by Cornelius Johnson of Martha Temple, Lady Penyston (1619) and Sir Alexander Temple (1620)
Condition Assessment: Looking Beyond the Surface
When the painting entered our studio, our conservators undertook a detailed examination and condition assessment.
At first glance, the portrait appeared dark and heavily yellowed. The sitter’s face remained visible, but much of the subtle modelling and background detail had become obscured beneath multiple generations of aged varnish. The overall appearance had taken on a deep brown cast that flattened the image and reduced visual depth.
Closer inspection revealed a far more complex history.
The canvas had undergone significant restoration work in the past, including the addition of a secondary lining canvas. Several historic tears had been repaired, but these repairs had been inadequately filled and heavily overpainted, leaving noticeable surface inconsistencies.
Large areas of dark retouching had been applied to disguise abrasion and previous damage, while layers of both natural resin and synthetic varnish had accumulated over time.
Above: areas of historic alteration show up darker under UV light
The conservator’s assessment noted:
- Extensive historic restoration campaigns.
- Multiple repaired tears.
- Discoloured natural resin varnish beneath a later synthetic varnish.
- Significant overpaint masking earlier repairs.
- Abrasion to original paint on raised canvas weave.
- Surface distortions caused by tensions within the lined canvas.
- Heavy dust accumulation on the reverse of the painting.
Although the painting remained structurally stable, it was clear that previous interventions were now obscuring rather than protecting the artwork.
Developing a Painting Conservation Plan
As with every historic painting, treatment began with testing.
Small solvent tests were carried out to understand the behaviour of the varnish layers and determine how they could be safely removed without affecting the original paint beneath. These tests confirmed that the synthetic varnish and underlying natural resin varnish responded differently and would need to be approached separately. Encouragingly, the tests also suggested that much of the extensive overpainting might be removed alongside the deteriorated varnish layers.
Based on these findings, our conservators recommended a more comprehensive treatment than originally anticipated.
The objective was not simply to clean the painting, but to reverse decades of visually intrusive restoration work and recover as much of the artist’s original intent as possible.
Above: small swabs are used to clean the surface and remove varnish, this swab shows the depth of discolouration being removed from the portraitÂ
The Restoration Process
Before any cleaning could begin, vulnerable areas of paint were carefully consolidated to ensure stability throughout treatment. The reverse of the painting was then dry-cleaned to remove accumulated dust and debris, improving both presentation and long-term preservation.
Above: our painting conservator Sabrina consolidating the surface of a painting in our studioÂ
The most transformative stage of the project was the gradual removal of the varnish layers. As the synthetic varnish was reduced, followed by the older natural resin layer beneath, the conservators began uncovering colours and tonal relationships that had not been visible for many decades.
What had appeared as a uniformly dark, brown portrait slowly regained depth and clarity. Flesh tones became more natural, subtle modelling re-emerged in the face, and details within the composition that had long been hidden began to reveal themselves once again. The owner himself remarked on the striking transformation, noting how severely the varnish had discoloured over time.
Above: the portrait part way through varnish removal treatment
Addressing Historic Repairs
Historic paintings often carry evidence of earlier restoration campaigns. Some may date back generations, from well-meaning Victorian over-painting to 20th century repairs. While these interventions were usually intended to preserve the artwork, the materials and methods used were very different from today’s conservation standards. Over time, old repairs can become visually intrusive, unstable, or even harmful to the original paint layers.
For this portrait, those earlier treatments had become part of the problem. With the discoloured coatings removed, attention turned to the legacy of previous restorations. Areas of heavy overpaint associated with old tear repairs were carefully reduced.
Losses were re-filled where necessary, surface irregularities were refined, and the earlier repairs were integrated more sympathetically with the surrounding original paint. Planar distortions across the canvas were also improved through careful tension adjustments, helping the portrait sit more naturally and reducing visual distractions caused by unevenness in the support.
Above: the portrait under UV light before and after conservation treatments
Ethical Retouching
Retouching is often misunderstood as repainting. In reality, modern conservation retouching is carefully limited to areas of loss or disruption, with the aim of restoring visual coherence while respecting the original artist’s work.
Historically, restoration was often approached very differently. It was common for damaged or worn areas to be heavily overpainted, with restorers effectively repainting sections of a picture to match contemporary tastes or conceal imperfections. While usually well intentioned, these interventions could obscure original paint, alter an artist’s handling and, in some cases, become more visually intrusive than the damage they were intended to disguise.
Above: a conservator retouching a painting in our studio
Today’s conservation standards follow a far more restrained and ethical approach. Rather than attempting to improve or reinterpret the artwork, conservators seek only to reintegrate losses so that the painting can be read as a coherent image, while ensuring that any additions remain identifiable under close examination and can be safely removed in the future if required.
For this portrait, carefully matched conservation pigments and reversible materials were used to visually reintegrate areas affected by historic damage and previous repairs. This allowed the eye to move naturally across the composition once again, without compromising the integrity of Cornelius Johnson’s original work.
Finally, a conservation-grade varnish with a softer, less reflective finish was applied to protect the surface, saturate the colours and improve the overall readability of the painting.
Above: conservation varnish being applied by hand
Restoring the Gilt Frame
The frame itself had its own story to tell. The owner was particularly keen that a historic handwritten label attached to the reverse be preserved, recognising its importance as part of the artwork’s provenance. Throughout treatment, care was taken to ensure this element of the object’s history remained protected.
Assessment of the frame revealed:
- Abraded surfaces.
- Areas of lost gesso exposing underlying wood.
- Previous bronze overpainting.
Above: our expert Tom restoring a gilt frame
- Cracks and losses around mitre joints.
- Missing decorative elements.
- General wear consistent with age and use.
Frame restoration included cleaning, consolidation, recreation of missing ornament, infilling damaged areas, sympathetic toning and application of protective finishes.
The result was a frame that once again complemented the portrait without erasing the evidence of its age and history.
The Result
By the conclusion of treatment, the portrait had been transformed, not into something new, but into something much closer to its former appearance.
The yellow-brown veil that had obscured the painting was gone. The sitter’s features regained clarity and presence, while the tonal relationships across the composition became readable once more. Areas of previous restoration that had once distracted the eye were carefully integrated into the whole.
Most importantly, the painting once again read as an early 17th century portrait, rather than a historic object dominated by discolouration and old repairs.
When the completed work was returned and rehung in its historic farmhouse setting, the owner placed it lovingly above a detailed model of the Sovereign of the Seas, creating a fitting dialogue with the maritime and mercantile world from which George Clarke emerged.
The ship evokes the ambition, trade and naval power of early Stuart England, while the restored portrait gives human presence to that same age: a London Merchant Taylor, returned to his former glory within a historic family home.
Do You Have a Historic Portrait in Need of Restoration?
Many historic portraits appear dark, muted or lifeless with age. Often, however, the original painting is not lost; it is simply hidden beneath discoloured varnish, surface contamination, old repairs and earlier restoration work.
At Fine Art Restoration Company, our conservators begin with careful assessment, testing and a tailored treatment plan. This may include stabilising fragile paint, removing aged varnish, reducing intrusive overpaint, repairing damage, retouching losses and applying a conservation-grade varnish for long-term protection.
Above: one of our conservators assessing the surface of a large oil paintingÂ
Professional portrait restoration can stabilise deterioration while preserving as much original material as possible. Whether inherited through a family collection, purchased at auction or rediscovered in a historic home, paintings like this Cornelius Johnson portrait often have far more life left in them than their condition initially suggests.
If you have an old, damaged or discoloured portrait in need of care, contact our conservation team via the form below for specialist advice and a free assessment.
We also offer nationwide collection and delivery, as well as guidance on worldwide shipping to our studio.
