Restoring a vintage piece of furniture involves decisions that cannot be undone. The order in which each stage is completed matters, and so does the question of how far the restoration should go. A piece returned to working, stable condition with its original finish intact — however worn — is generally preferable to one stripped and refinished to look new. The distinction between conservation and restoration is worth keeping in mind from the start.
Assessment before any work begins
Before touching a piece, examine it in good natural light and note: which joints are loose or failed; whether the wood has active woodworm (fresh sawdust and exit holes are the markers); the nature of the existing finish (shellac, wax, varnish, or paint); and whether any previous repairs have been made and how well they were done. Photographs taken at this stage provide a reference point throughout the process.
Loose joints in chairs are almost always the first structural issue to address. A chair that wobbles is not just uncomfortable — the racking stress accelerates failure of the remaining sound joints. Stabilising the structure before doing any surface work prevents further damage during the process.
Cleaning: the first step that is often enough
Many pieces that appear to need full restoration need only a thorough cleaning. Decades of accumulated wax, grime, and oxidised oil can obscure a finish that is structurally sound. Removing this buildup with a mild solution of Murphy Oil Soap and warm water, applied with a soft cloth and immediately wiped dry, often reveals a surface that requires nothing further beyond a coat of wax.
For heavier deposits — kitchen grease, smoke residue, or multiple layers of incompatible wax — a 50/50 mixture of boiled linseed oil and mineral spirits (turpentine) applied with fine steel wool (0000 grade) will cut through buildup without damaging shellac finishes. Work with the grain, and wipe off the dissolved residue before it dries.
Identifying the existing finish
The most common finish on Italian furniture made before 1900 is shellac, applied as French polish (a spirit varnish built up in many thin coats). Shellac dissolves in alcohol — applying a drop of denatured alcohol to an inconspicuous spot and waiting thirty seconds will show whether the finish softens and becomes sticky. If it does, the finish is shellac-based and should be treated accordingly.
Shellac is both the easiest and most sensitive of the traditional finishes to work with. It can be repaired locally by dissolving the damaged area with dilute shellac solution and working the fresh finish in using a polishing pad. It does not respond well to water or to modern polyurethane varnishes applied over it.
- Shellac (French polish): dissolves in alcohol; repaired with dilute shellac; do not apply water-based products over it
- Oil-and-wax finish: the surface feels slightly tacky when warm; revived with linseed oil and carnuba wax
- Nitrocellulose lacquer (post-1920s): harder, resists alcohol; stripped with lacquer thinner
- Polyurethane (post-1960s): very hard, plastic feel; must be sanded off completely if refinishing is planned
Stripping: when it is necessary and how to approach it
Full stripping should be a last resort, used when the existing finish is so badly damaged, cracked, or contaminated that local repairs are impossible, or when an incompatible finish (polyurethane over shellac, for example) must be removed to allow period-appropriate refinishing. Chemical strippers are effective but aggressive — they require neutralisation before the new finish is applied, and they can raise the grain, darken the wood, or loosen veneer adhesive.
Stripping a 19th-century Italian walnut piece to bare wood and applying a fresh coat of polyurethane is not restoration — it removes the material history of the object along with the damaged finish.
For pieces where stripping is unavoidable, a citrus-based stripper applied generously and left under plastic sheeting for an hour will soften most traditional finishes without the aggressive fume profile of methylene chloride products. Remove the dissolved finish with a plastic scraper and coarse burlap rather than steel wool, which leaves metallic residue that causes staining on walnut and cherry.
Filling and repairing surface damage
Small scratches and gouges in a shellac finish can be filled with shellac sticks — coloured waxy sticks melted into the void with a heated tool — before the surface is levelled and polished. This technique is used by professional restorers and, with practice, produces results that are nearly invisible in normal light.
Larger fills in areas of missing veneer or solid wood require epoxy wood filler tinted to match the substrate, or a graft of matching wood. Tinted epoxy fills are stronger than wood and will not move with humidity changes. A well-matched wood graft will age with the surrounding material more convincingly but requires accurate cutting and fitting.
Re-finishing: matching the period
If the decision to refinish has been made, the choice of finish should follow the period of the piece. Shellac is appropriate for anything up to around 1930. It is available ready-mixed or as flakes dissolved in denatured alcohol. The traditional French polishing method — applying very thin coats with a polishing pad (the tampon) in circular and figure-eight strokes — produces a depth of finish that is difficult to achieve by any other method, but requires practice and patience.
Wax applied over an oil base is the appropriate finish for pieces from the provincial or vernacular tradition where French polish was not used. Carnauba wax mixed with beeswax, applied in thin coats and buffed out, produces a soft, low-sheen surface that protects adequately and is easy to maintain.
For technical reference on traditional finishing methods, the Conservation department at major Italian museums publishes occasional guides. The ICCROM documentation on wooden object conservation provides more detailed technical guidance on reversible treatment methods.