Why Paintings Darken and Yellow

Four Causes Behind a Brown Picture

A darkened painting is a stack of optical problems. Conservators sort them before they touch a swab. The first sort is between material that sits on the paint and material that is the paint. Dirt, nicotine, cooking grease and soot belong to the first group. Yellowed varnish, if it is a later coating, also belongs there. Yellowed oil inside the original film, altered pigments, and paint that has grown transparent belong to the second. The first group is, in many cases, removable. The second group is the painting as it now exists.

Original tonality sits beside both groups. Painters from the fifteenth century onward used coloured grounds, umber shadows, bituminous glazes and chiaroscuro that were dark on day one. A Rembrandt or a Caravaggio that looks brown in a dim room may be doing what the painter asked. A Watteau whose overpaint has gone translucent, or a Uccello whose vermilion harness has gone grey, is not. The diagnostic job is to tell those cases apart. Edges hidden by a frame rebate, areas under an old mount, or a strip protected by a later addition often keep a closer record of the first colour. Conservators read those margins before they decide that the whole surface is “dirty.”

Dirt is a brown and yellow filter. Urban soot, candle smoke and tobacco tar sit in the valleys of impasto and in the cracks of aged varnish. They darken shadows more than lights and flatten modelling. They can also feed later chemistry. Marika Spring and Rachel Grout, writing in the National Gallery Technical Bulletin in 2002, traced chloride in blackened vermilion to sodium chloride in gallery dirt, including salt from skin debris on calcium-rich particles. A dirty surface is both a veil and, for some pigments, a reagent.

The table below is a working map. Two causes can occupy the same square centimetre. A copper-green glaze under a mastic varnish under a century of London soot will look like one brown field until someone examines it in raking light, under ultraviolet, and in cross-section.

The Chemistry of Drying Oils

Oil paint dries by reaction with air. Linseed, walnut, poppy and later safflower oils contain unsaturated fatty acids. Those double bonds take up oxygen, form peroxides, and cross-link into a solid film. The same unsaturation that lets the film set also feeds later colour. L. K. Cairns and P. B. C. Forbes, in a 2020 Heritage Science study, restated a long laboratory consensus: oils with more unsaturation yellow more. Linseed, rich in linolenic acid, yellows more than poppy. The yellow species themselves remain unidentified. The working account, which they summarise from earlier literature, is that two kinds of compound share the job: one that reflects yellow light, and one that fluoresces yellow. Conservators have measured the fluorescence for forty years. They still cannot name the molecules.

Pigments steer the same reactions. Lead white, copper carbonates and some cobalt pigments accelerate yellowing of the oil around them. E. René de la Rie showed in the early 1980s, in Studies in Conservation, that fluorescence in linseed films and natural resins appears only after degradation, and that it tracks yellowing. Some pigments inhibit that fluorescence; some enhance it. A white passage in linseed and a white passage in poppy, both a century old, will not age to the same cream. Painters already knew the practical version. They reserved poppy or walnut for pale flesh and skies, and accepted linseed in the darks, where a later yellow shift is harder to see.

Heat, driers and processing change the starting colour as well as the later one. Getty publications on painted wood note that oil heated in lead pots, or boiled with lead compounds to speed drying, produced a darker, faster film that yellowed more than oil without those driers. Stand oil, linseed pre-polymerised by heat, lacked some of the UV-absorbing peaks of raw linseed in Cairns and Forbes’s liquid spectra. Water-miscible linseed tracked ordinary linseed.

Linseed, walnut, poppy and the fat film

Linseed oil is the default European easel medium from the fifteenth century. Walnut appears in Italian sources and in passages where painters wanted a paler film. Poppy, slower and less yellowing, became a studio habit for whites and pale blues. Safflower entered modern tube paint as another low-yellowing oil, with its own drying problems that Tate’s Cleaning Modern Oil Paints project has had to face. None of these oils is colourless once it has polymerised. The question is how much yellow the painter, and later the viewer, will tolerate.

A fat film yellows more than a lean one because there is more oil per unit of pigment. Glazes, rich medium, and “oiling out” to revive a sunken passage all add vehicle. Conservators see the result as a local warm cast: a sky that has gone greenish, a white collar that has gone ivory while the leaner grey beside it has held. Excess oil also wrinkles and remains sensitive to solvents for longer. The yellowing and the mechanical weakness travel together.

Alkaline vapours push the same films toward brown. Cairns and Forbes used an ammonia chamber to accelerate that shift and watched fluorescence move from blue toward green and yellow. Household ammonia is a studio and storage risk more than a gallery one.

Dark yellowing and bleaching in light

Store a dried oil painting in a cupboard and the whites can go yellow in weeks or months. Bring it into ordinary room light and much of that yellow fades. Henry W. Levison documented the cycle in the Journal of the American Institute for Conservation in 1985. He ran drying oils and acrylic emulsions through four rounds of dark storage and bleaching in diffuse daylight. The oil films yellowed in the dark and returned, within experimental error, to their first whiteness. Age of the film and number of previous cycles did not set a ceiling. Acrylics yellowed far less.

Joyce Townsend and colleagues, reporting to ICOM-CC in 2011, added a museum-scale caution. Works kept in the dark or in dim light for a long time may need years of typical gallery illumination to recover, not an afternoon on a windowsill. Cairns and Forbes later showed that a broad visible spectrum bleaches the yellow; 254 nm or 365 nm UV alone, in their 24-hour tests, did not. They also stressed that bleaching is a photodegradation reaction. It restores colour at a cost to the polymer. Conservators do not “sun” paintings as a treatment. They display them under controlled light and accept that a picture coming out of long storage will look warmer until the gallery does its slow work.

Artist forums treat cupboard yellowing as a defect in the tube. It is a property of the dried oil. A painting that yellows in a rack and then recovers on the wall is following Levison’s cycle. A painting whose varnish has oxidised for eighty years will not recover in the same way. The two yellows share a colour and almost none of their chemistry.

Varnish Films and the Dirt They Hold

A picture varnish is a thin organic coating with a large surface area. The National Gallery of Art in Washington, in its varnish research pages associated with E. René de la Rie, puts the aesthetic job first: saturation and gloss, the wet-pebble effect. Protection from dirt is secondary. Traditional natural-resin varnishes do both jobs for a while, then fail at both. They yellow, lose transparency, and crack. Dirt lodges in the cracks. The viewer reads one brown surface.

Mastic and dammar are the resins most often named in nineteenth- and twentieth-century gallery practice. Raymond White and Jo Kirby, surveying National Gallery, London, varnishes in Technical Bulletin 22 (2001), found mastic in common use from the 1850s, sometimes with linseed oil. Those compositions belong with the materials history of varnish. The point for darkening is simpler. A natural-resin film oxidises in light and air. After some decades it is a yellow filter. After more decades it may be brown, brittle and only partly soluble. Ultraviolet examination often shows a strong greenish-yellow fluorescence, the same family of degradation products de la Rie tied to yellowing in the 1980s.

Oil-resin varnishes behave worse. Tate’s account of Reynolds’s Lord Ligonier (1760) describes a hard, dark layer, likely a fossil resin such as copal dissolved in hot linseed oil, left as a residue after later restorers took off the upper varnish. National Gallery records from 1859 already noted a “brown oil varnish apparently all over.” Nineteenth-century painters and restorers favoured those oil varnishes for toughness. Age made them dark and insoluble. Strong solvents that might swell them also swell original paint. Conservators now often thin or leave such residues rather than chase a bright original that the solvent would take with it.

Dirt on an unvarnished modern oil is a different surface. Tate and the Getty Conservation Institute, in the Cleaning Modern Oil Paints collaboration, describe twentieth-century oils that pick up dirt, form medium skins, and can be water-sensitive. The yellow-brown of an 1820 varnish and the grey film on a 1960 unvarnished oil do not yield to the same method. Full treatment sequences sit in the restoration guide. The chemistry here is that the coating you can still reverse is the coating that has not yet become the paint.

Pigments That Darken in the Film

Pigment change is the part of darkening that cleaning cannot bargain with. The particle has become another compound, or the particle has dissolved into soaps that no longer scatter light. Cross-sections show the new species sitting in the original layer. A solvent that removes varnish will not put Cu(II) acetate back, or turn calomel into cinnabar. Painters abandoned some of these colours once the failure became obvious. Others stayed on the palette because the risk was uneven: vermilion that survives on one drapery and greys on the next.

Light, humidity, dirt and the oil itself set the rate. Frame rebates, glazes and even an old varnish can slow a reaction by cutting light or chloride. The same painting can therefore hold a green tree and a brown tree, a red sleeve and a grey sleeve, with no difference in the painter’s intent. Technical study has to sample both, or the “original colour” becomes a guess from the damaged passage.

Three pigment families dominate the published easel-painting literature: copper greens, vermilion, and smalt. Lead white belongs beside them as an opacity problem rather than a hue shift. The darkening question on old pictures returns to those four.

Copper greens: verdigris and copper resinate

Verdigris (copper acetate) and copper resinate (copper salts of resin acids) gave Renaissance painters a brilliant green in oil. By the eighteenth century most had dropped them. Areas protected by frames stayed greener; brown spread from cracks that let in air.

Didier Gourier and colleagues, in Inorganic Chemistry in 2019, gave that pattern a mechanism. Both pigments are bimetallic Cu(II) complexes with carboxylate bridges. Light in the ligand-to-metal charge-transfer band, around 410 nm in their experiments, drives substitution of those bridges by dioxygen. The product is a peroxo-copper(II) dimer that absorbs in a region that reads as brown. Copper resinate, with more space between the complexes, darkened more than the acetate. Boiled linseed oil, which some painters used to speed drying, slowed the reaction relative to raw oil.

The change sits inside the paint film. Cleaning a yellowed varnish over a browned copper glaze will recover some saturation in neighbouring colours and leave the foliage brown. Colour reconstructions that “put the green back” are digital or didactic exhibition graphics. Painters who glazed copper green with yellow lake, or who mixed it with lead white, left still more routes for later shift. Hermann Kühn’s older surveys, and David Scott’s Copper and Bronze in Art (Getty Publications, 2002), remain the handbook trail. Gourier’s photochemistry is the current molecular account.

Vermilion: grey crusts and chloride

Vermilion, mercuric sulphide, is red in both the mineral (cinnabar) and the dry-process synthetic used before the wet process of 1687. On some paintings it is still red after six hundred years. On others it carries a black or silver-grey crust. Spring and Grout examined ten National Gallery pictures and two from the Courtauld, all predating wet-process vermilion, including Uccello’s Battle of San Romano (NG 583) and Jordaens’s Holy Family (NG 164).

The crust was never only black. White mercury(I) chloride (calomel) sat with a black phase, likely metacinnabar. The mix explains the lilac-greys and light greys as well as the dark ones. Unaltered red remained underneath.

Chloride was the trigger. Unaltered vermilion in the same works was chlorine-free. The paintings had a history of being dirty. Gallery dirt analysed in London contained sodium chloride on calcium-rich particles, consistent with skin debris. The proposed path runs from vermilion plus chloride to corderoite (Hg₃S₂Cl₂), then, in light, to calomel. Glazes over still-red vermilion had protected those passages from dust and light. Varnish helped in part. Wet-process vermilion can blacken from manufacturing impurities as well; that is a later, separate caveat. Dry-process vermilion on these pictures was chlorine-free until dirt supplied the ion. Preventive removal of dirt can matter for vermilion still intact. Cleaning cannot undo a crust that has already formed.

Smalt: blue glass that stains the oil

Smalt is a potassium cobalt glass, ground as a cheap blue. In oil it loses colour and yellows the medium around it, so drapery goes grey-brown or greenish-grey. Joyce Plesters noted the discoloration in 1969.

Marika Spring, Catherine Higgitt and David Saunders, in the National Gallery Technical Bulletin in 2005, confirmed potassium leaching from the glass, potassium soaps in the film and in surface crusts, and yellowing of the oil. Blanching, drying cracks and a light-scattering crust can make the same passage look darker in hue and chalkier at the surface.

Humidity and later cleaning solvents can move those hygroscopic salts again. The stacked process is leaching, soap formation and oil yellowing. Solvent cleaning will not put potassium back into the glass.

How the Change Proceeds Over Time

Darkening runs in stages. In the first months the oil film sets, sinks or stays glossy, and may show dark yellowing if you put it away. In the first decades a natural-resin varnish, if present, begins to yellow in light. Dirt accumulates in proportion to the room: tobacco, candles, kitchens, urban coal smoke. In the same decades copper greens in light and air begin their photochemical slide. Vermilion waits on chloride and humidity. Smalt in oil starts to leach potassium. Lead white begins to form soaps.

A. P. Laurie, in work from the 1920s and 1930s, measured a rise in the refractive index of drying oil from about 1.48 in a fresh film toward 1.57 in a mature one. As the index of the medium approaches that of the pigment, the paint scatters less light and looks more transparent. Dark grounds then dominate the tone. Pentimenti show. J. P. Campbell has described the effect in Watteau at the Scottish National Gallery: Fêtes vénitiennes now shows an earlier placing of the dancer’s legs through paint that has gone translucent.

Laurie’s optical account is still taught. For lead white it is incomplete. Alexander Eibner suggested as early as 1909 that lead soaps, besides the oil’s index, make lead-white films transparent. Joyce Townsend argued in 1993 that Laurie’s index shift is too small to explain the change in high-index pigments (lead white sits around 1.9 to 2.1). Annelies van Loon, Jaap Boon, Petria Noble and colleagues, working on seventeenth-century Dutch paintings including Rembrandt’s Anatomy Lesson of Dr Nicolaes Tulp (Mauritshuis), showed lead-soap aggregates and dissolution of lead white in grounds. Converted particles sit in a medium whose index is closer to oil. You look down onto the dark layer the painter meant to hide.

None of these clocks runs at gallery-label speed. A picture varnished in 1880, hung over a fireplace, with copper-green trees and a lead-white sky, will present as an old brown painting by 1920. The same composition in a clean, stable room may still show a removable varnish as the main veil, with pigment change only in the greens. Technical imaging and sampling separate those histories. Infrared and X-radiography, covered elsewhere in this series, show pentimenti and losses. They do not by themselves tell you whether the brown is dirt or saponified ground. That takes surface examination, UV, and a cross-section.

Painters and Restorers Already Knew

Studio practice recorded the problem before laboratories named chromophores. Treatises warn that linseed yellows and that poppy is safer for whites. Painters who wanted the depth of old-master glazes reached for asphaltum and copal, then watched darks wrinkle or remain tacky. Joshua Reynolds’s reputation for bitumen is a cautionary tale with a dispute inside it. Nineteenth-century writers, the Redgraves among them, blamed his darks on asphaltum. National Gallery analysis of his notes and of samples (including bitumen in a curtain shadow on Lady Cockburn and her Three Eldest Sons) shows he used it, and not as a universal glaze. Conservators still meet wrinkled, darkened passages in eighteenth-century British portraits where medium experiments outran the oil’s ability to set. The historical awareness is that “Old Master brown” was already a complaint in the painter’s lifetime, not only a later gallery accident.

Nineteenth-century galleries made the complaint public. Natural-resin and oil varnishes on the National Gallery’s walls yellowed in London air. Restorers removed them, sometimes with methods that later generations judged too fierce. The public fights over how far to clean belong with restoration controversies. The factual residue is that curators and chemists have argued for 170 years about dirt versus intended tonality.

Edges and covers taught the same lesson without a committee. Gourier’s copper-green study used the green rebate as evidence that light and oxygen do the damage. Tate’s Lord Ligonier showed bright, clean paint at the margin once the upper varnish was off, against a darkened field that still held an older oil-varnish residue. Conservators still use those margins as a colour note. A picture whose rebate is as brown as its centre is not waiting for a miracle clean. A picture whose rebate is cool and whose field is tobacco-yellow may be.

Who Measured the Yellow and the Brown

A. P. Laurie (Royal Academy professor of chemistry) gave easel painting a refractive-index story. Alexander Eibner in Munich added lead soaps in 1909. Rutherford Gettens and George Stout put both in the conservator’s handbook. Robert L. Feller, at what became the Getty Conservation Institute, built accelerated-ageing methods so yellowing and brittleness could be compared under controlled light and heat. His 1994 Getty volume Accelerated Aging remains the caution that yellowness is not a proxy for every other failure.

E. René de la Rie, at the Metropolitan Museum of Art and then the National Gallery of Art, tied fluorescence to yellowing in oil and resin (1982) and measured how varnish molecular weight and refractive index change saturation and gloss (1987). Joyce Plesters at the National Gallery, London, opened smalt discoloration as a pigment-medium problem in 1969. Ashok Roy’s Technical Bulletin programme made those case studies serial and public. Marika Spring’s papers on vermilion (with Rachel Grout, 2002) and smalt (with Higgitt and Saunders, 2005) are the current museum-standard accounts of those two darkenings. Annelies van Loon’s 2008 dissertation, with Boon and Noble, is the metal-soap account of transparency. Henry Levison (1985), Leslie Carlyle and colleagues (ICOM-CC 2002), and Joyce Townsend (2011) mapped dark yellowing and bleaching. Cairns and Forbes (2020) added fluorescence as a quantitative watch on oil yellowing. Gourier’s group (2019) closed a long gap on copper greens. Bronwyn Ormsby and the Tate and Getty modern-oils work shifted the dirt problem onto unvarnished twentieth-century paint.

Disagreements that remain are named as such. The exact chromophores in yellowed linseed are unknown. Laurie’s index rise is real and insufficient for lead white. Reynolds’s bitumen is documented in places and over-blamed in others. Vermilion’s black phase is likely metacinnabar because Raman cannot separate it from cinnabar.

What Cleaning Can Reverse, and What It Cannot

“Cleaning” in paintings conservation means removal of non-original material: dirt, later varnish, later overpaint. Bleaching the oil, reducing copper dimers, or reconstituting vermilion sits outside that job. The National Gallery of Art’s varnish notes state the solvent problem in one direction: aged natural resins need polar mixtures; those mixtures can swell and leach original paint. Some films cannot be treated with solvents at all. Success is a varnish that comes off while the paint stays. Failure is a paint film that moves with the varnish, or a residue so cross-linked that the solvent required would take original glaze with it.

Dirt on a sound varnish is the easiest win. Conservators lift it with aqueous systems or other methods matched to the surface, then decide whether the varnish itself should go. A yellowed mastic that is still soluble can change the picture more than any other single step. Art UK’s account of treating Michele Rocca’s La bocca della verità for the Holburne Museum, and Joan Carlile’s Portrait of an Unknown Lady at Tate Britain, describes the familiar reveal: blues and reds that had read as mud. The National Gallery of Art’s Constable White Horse sketch had been de-attributed under discoloured varnish and later repaint; removal, over years, returned both the sketch and the name.

Modern unvarnished oils, as Tate frames them, may not accept water-based dirt removal. Medium skins, efflorescence and water sensitivity mean that a clean can pick up pigment. Richard Wolbers’s gel and emulsion systems, and later surface-attached gels for synthetic coatings, exist because the old solvent hierarchy fails on those surfaces. You remove what is on top, if you can do so without taking original material. You do not rewind the binder.

Dirt and later varnish

A swab that yellows in a test window names a removable film. Conservators test in several colours because a solvent that is safe on lead white may bite a red lake or a copper glaze. They work under magnification, change cotton often, and stop at a thin residue if the paint begins to move.

Leaving a stain of old varnish in the interstices of impasto is a common, deliberate choice. So is thinning rather than stripping an oil-resin that has become the surface.

Overpaint is a separate campaign. Later restorers matched the yellowed varnish, not the original. Once the varnish goes, their retouching sits as islands of wrong colour. Removing it is slow and is not always possible where it has stained the original. The Constable case needed years because the overpaint was thick and resinous. A private portrait with one discoloured dammar coat may need hours. The chemistry does not care about the market value. The time cost does.

Pigment conversion and the transparent film

Copper greens that have gone brown stay brown. Vermilion crusts stay grey. Smalt stays grey-brown. Lead-white passages that have saponified stay more transparent than the painter left them. Inpainting can sit in losses. It cannot be laid as a veil over an entire browned landscape without becoming a new picture. Digital reconstructions for exhibition graphics are honest about that. They are hypotheses from surviving margins, other versions, and pigment identification.

Dark yellowing of the oil is the awkward middle. Light bleaches some of it. Conservators do not use bleaching lamps as a substitute for cleaning. They may note that a picture from store will warm and then ease under display lighting, and they will not chase that yellow with solvent. Permanent oil yellowing in a fat linseed glaze is likewise in the paint. A new, paler varnish can saturate the surface without adding as much yellow as aged mastic. It cannot subtract yellow from the glaze beneath.

Irreversible change also includes leaching. Solvents that remove varnish can extract low-molecular-weight components from aged oil, leaving a leaner, more matte, more brittle film. Each full varnish removal is a small ageing event for the paint even when the colour looks better. Ethical codes (AIC, Icon) put reversibility and minimal intervention first for that reason. A brown picture that is stable may be left brown if the solvent risk is high and the “dirt” is in fact original glaze.

What Treatment Costs Today

Private paintings conservation in the UK is still billed by the hour in many studios. Published figures from small practices sit around £40 to £45 per hour, with a modest canvas surface-clean quoted in a few hours and varnish removal on a small work in about four to seven hours. That is a floor for a simple, sound picture, not a quote. Larger formats, insoluble oil-resin, overpaint, tears and lining sit in another band. US private practice, in a 2015 Art Business News round-up, cited a small painting with average work at about $800 to $1,000 and a large damaged canvas at $10,000 to $15,000. Treat published bands as order-of-magnitude and dated. A written examination and test-clean is the real price list.

Museum treatments are staff time. A campaign on a large Reynolds or a multi-figure Uccello runs for months, sometimes years, with scientists on call for analysis. The Constable White Horse work at the National Gallery of Art took several years. Tate’s Lord Ligonier project is a multi-stage research treatment. Those costs sit in departmental budgets and in grant lines. A national collection can wait until the chemistry is understood. A private owner with a yellowed grandfather portrait faces a four-figure invoice for a reversible clean.

Money does not buy pigment reversal. A full invoice for cleaning, filling and retouching can make a picture look vivid while leaving browned copper greens and grey vermilion as they are. Owners who budget for “getting the colours back” need that distinction before they commission. Conservators who belong to Icon or AIC will write it into the proposal. Shops that promise a Renaissance brightness from a bottle are selling solvent risk. For the sequence of a professional treatment, use the pending restoration guide. For the institutions that hold the reference pictures in this article, browse museums.

FAQ

Viewers often ask why gallery paintings look so brown, whether cleaning will restore the original colour, and which changes are permanent. The short answers below separate dirt, varnish, oil yellowing and pigment alteration. They do not give DIY cleaning instructions. For studio process and costs, use the restoration sibling once it publishes.

Why do old paintings look so dark?

Several layers contribute at once. Dirt and smoke sit on the surface. Natural resin varnishes oxidise to yellow-brown. Linseed oil in the paint yellows. Some pigments convert (copper greens, vermilion, smalt). Oil films grow more transparent, so dark grounds show through. Painters also used brown grounds and dark glazes on purpose. A conservator’s examination sorts those causes. A single brown look in a photograph does not.

Does linseed oil always yellow?

Linseed yellows more than poppy, walnut or safflower because it is more unsaturated. Fat films, lead and copper pigments, heat-processed oil, darkness and alkaline vapours all increase the effect. Some of the yellow that appears in dark storage bleaches in ordinary light (Levison 1985; Townsend 2011). Chromophores in the aged film are still unidentified (Cairns and Forbes 2020). Painters used poppy or walnut in pale passages to limit the shift.

Can yellowed varnish be cleaned off?

Many later natural-resin varnishes can be removed or thinned with solvents or gels if the original paint is less soluble than the coating. Oil-resin and copal-type films may be only partly soluble. Aged paint can swell and leach in the same solvents that take the varnish. Test windows, ultraviolet examination and, where needed, analysis come first. The restoration process itself is a separate guide.

Will cleaning restore the original colours?

Cleaning can restore the colours that dirt and later varnish were hiding. It cannot restore colours that the pigments and the oil have already become. Browned copper resinate, grey vermilion, degraded smalt and saponified lead white remain. A new varnish can saturate what is left without adding as much yellow as aged mastic. Digital reconstructions are hypotheses, not treatments.

Why do greens in old pictures turn brown?

Copper acetate (verdigris) and copper resinate in linseed oil undergo a light-and-oxygen reaction. Bridging ligands are replaced by dioxygen, forming peroxo-copper dimers that look brown (Gourier et al., 2019). Edges hidden by frames often stay greener. The shift is in the paint layer. Varnish removal will not reverse it.

How much does professional cleaning cost?

UK studio rates published by small practices are about £40 to £45 per hour; a simple small varnish removal may be quoted in a working day or two. US private work in published interviews has ranged from under $1,000 for a small, straightforward picture to five figures for large damaged canvases. Museums absorb staff time over months. Get a condition report and a test-clean from an Icon- or AIC-affiliated paintings conservator. Price without examination is advertising.