Paintings Restoration
Varnish Removal and Colour Recovery
Medium
Oil on canvas
Treatment
Varnish Removal & Surface Reintegration
Damage Type
Surface Deterioration
A nineteenth-century oil on canvas, attributed to a significant European painter, arrived at the studio with a heavily discoloured varnish that had shifted the tonal balance of the entire composition. The collector had lived with the work for twenty years without realising the extent to which the original palette had been obscured.
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Examination & Analysis
Cross-section microscopy revealed a complex stratigraphy: the original paint layer was overlaid by at least two distinct varnish applications, the earlier of which had partially penetrated the uppermost paint layer. UV fluorescence distinguished the two varnish layers clearly, with the older layer fluorescing a deep yellow-green and the more recent application appearing as a patchy, non-fluorescent film. Solubility testing was conducted across a matrix of solvents and solvent mixtures to identify a system capable of removing the upper varnish without disturbing the original paint.
Varnish Removal
Cleaning was carried out in stages over four weeks, working across the surface in small sections under magnification. The selected solvent system — a buffered aqueous solution with a small proportion of ethanol — proved effective in removing the upper varnish while leaving the earlier layer largely intact. In areas of particular sensitivity, mechanical cleaning with a fine swab was employed to supplement the chemical action. The conservator paused at regular intervals to assess the emerging surface under raking light and UV.
Surface Reintegration & Revarnishing
Following varnish removal, minor losses in the paint layer were filled and inpainted in watercolour and Gamblin Conservation Colours, matched to the surrounding surface under natural and artificial light. A fresh, stable varnish — a dilute solution of Paraloid B-72 in xylene — was applied by brush in two thin coats to unify the surface and provide long-term protection.
Outcome
The transformation was striking. The original palette — warm ochres, cool greys and a luminous sky — was revealed in full for the first time in an estimated sixty years. The collector described the experience of seeing the work as "meeting it for the first time." A full photographic record of the treatment was prepared and archived.
"Beneath sixty years of oxidised varnish, the original palette emerged — warm, luminous, and entirely transformed from what the collector had known."
Aishwarya Ch
Technical Methods Employed
Cross-section microscopy, UV fluorescence, solubility testing, buffered aqueous cleaning, Gamblin Conservation Colours inpainting, Paraloid B-72 varnish.
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