Gilding and gold leaf on lighting

At a glance

Qualitative only: no durability figure for gilded luminaires was found. Sources: US National Park Service, CCI (Michalski), AIC Conservation Wiki, two leaf suppliers and our gilding pages. The gilder confirms every row.

Choose the system before the shade

Gilding is metal leaf laid on a prepared surface. On a luminaire the surface is usually a carved timber part or a metal frame, arm, canopy or cup. The system under the leaf decides the look, how the finish wears and how it can be cleaned, so choose it before you choose the shade.

• Water gilding. Animal-glue gesso is built up on the surface, then a clay bole; the leaf is laid on bole that has been wetted, and can be burnished with an agate to a mirror shine (Conservation Wiki; our gilding journal article). It is the only method that burnishes, and the most fragile.
• Oil gilding. The leaf is laid on an adhesive size, oil or acrylic, instead of a wetted bole. The sheen is satin and even, and the finish is more robust, so it suits surfaces that are handled or exposed (our journal article and gilding craft page).
• Imitation leaf. Dutch or composition metal gives the colour of gold without gold. It is a copper and zinc alloy and tarnishes unless sealed (supplier statements).

On a metal frame the ground has to bond to the metal, and nothing we read says which system suits brass, steel or cast frames. Ask the gilder which system they propose for the base material, and why. For plated gold rather than leaf see plating and coating thickness.

Carat, shade and what is not gold

Carat is a fraction of 24: 24 carat is pure gold, so 22 carat is 22 parts in 24 by mass, or 91.7 per cent. Our journal says genuine leaf is most often 22 to 24 carat. Lower-carat leaf is alloyed with more silver, which makes it paler and greener; one supplier lists “lemon” leaf at 18½ carat and “pale” leaf at 16, and says the silver can tarnish. Another supplier says high-carat genuine gold often resists tarnish, but that lower-carat alloys, handled surfaces and some environments may need protection. The National Park Service guide says silver and lesser grades of gold oxidise rapidly.

So the question to ask is not “is it real gold?” but which leaf, in writing: name, carat and shade, and what it is sealed with. Imitation leaf and composition leaf contain no gold.

The ground, the seal, humidity and heat

The leaf is thinner than anything under it, so what lies beneath does most of the work. For water gilding the weak point is the ground: the Canadian Conservation Institute’s study of gilding cracks found low humidity the main danger to glue-and-gesso gilding, and fast change in humidity what does the harm; high humidity is relatively harmless because the glue responds within a day. Gold leaf acts as a vapour barrier, so leaf-covered wood responds slowly, and sealing bare surfaces and ends slows it further. The National Park Service guide adds that in very humid conditions the gesso absorbs enough water vapour to soften and expand, and may chip away.

Sealing is chosen for the setting. Our craft page says waxes and shellacs suit residential pieces and robust lacquer systems suit imitation leaf and high-traffic or humid places. No source we read gives a temperature limit for any size, wax, shellac or lacquer, so for a lamp holder or cup ask the gilder for the temperature the whole system is rated for, and ask the lamp maker what temperature the holder reaches (see lamping glass lighting).

Ask for a sample board of the proposed system, on the same base material, showing leaf, ground, seal and sheen, approved before gilding starts (see sample hierarchy and approval). Gold reads differently against a dark interior and a pale one.

Where a gilded luminaire is stressed

A gilded arm is stressed in five places. The drawing marks them; the list says what each means for the specification and for housekeeping.

• 1 Heat. At the lamp holder and cup. Ask for a rated temperature; do not assume a seal tolerates it.
• 2 Touch. The lowest curve and the finial are where hands and cloths land. The National Park Service guide says skin oils can accelerate oxidation of gilt, and calls gilt the most fragile of all finishes.
• 3 Dust. Tops of arms and knops collect it. The same guide says to dust gilt gently with a soft-bristled brush and a low-power vacuum held at least half an inch (about 13 mm) away.
• 4 Edges and joins. High points and joins are where leaf is likely to rub through first. This is our reading, not a sourced finding.
• 5 Liquids. Overspray from cleaning the glass runs down onto the metal. Keep cleaners away from gilding unless the gilder’s sheet allows them.

Care in service

Care for new gilded work comes from the gilder, who knows the leaf, ground and seal. Conservation literature is written for old objects and is a guide to what can go wrong, not a hospitality method.

Glass elements on the same fitting are cleaned differently: see cleaning Murano and crystal chandeliers. For the handover pack see O&M information for decorative lighting, and for plain metal finishes cleaning and maintaining metal finishes.

Gilding to [frame, arms, canopy; drawing ref]: [water / oil] gilding with [genuine gold leaf, [23] carat, shade [ ]] over the ground system proposed by the gilder for the base [metal / timber] and approved in writing. Burnished areas [ ]; matt areas [ ]; distressing or antiquing [none / as approved sample ref]. No imitation or composition leaf unless named in writing.

Seal: [type] in [ ] coats over all gilded surfaces, as stated by the gilder. The gilder is to state in writing the temperature the finished system is rated for at the lamp holder and cup [ ] and the relative humidity range it is rated for [ ] to [ ] per cent. Gilded parts within reach of guests: [to be sealed and noted on the care sheet].

A sample board of the proposed system on the same base material, showing leaf, ground, seal and sheen, is to be approved by [designer] before gilding starts [sample ref]. The gilder is to supply a care sheet for the handover pack: routine dusting method, what must never be used, touch-up method, and who may do it.

Standards and sources

• US National Park Service, Museum Handbook Part I, Appendix N: gilt, gilded bronze; 2004, modified 2020; read 6 Nov 2026.
• Michalski (CCI): Crack mechanisms in gilding: humidity and gilding; read 6 Nov 2026.
• Reilly and Mortimer, JAIC 37(2), 1998, section 7.1: spirit-lacquer imitation gilt.
• No standard applies: we found no British or international standard for gilded finishes.

Questions we are asked

What is the difference between water gilding and oil gilding on a chandelier?

Water gilding builds gesso and bole under the leaf, and is the only method that can be burnished to a mirror shine; it is also the most fragile. Oil gilding lays the leaf on an adhesive size, gives a satin, even sheen and is more robust, so it suits surfaces that are handled or exposed. Ask the gilder which system they propose for the base material.

Is the gold leaf on a chandelier real gold?

It can be, but ask. Genuine leaf is sold by carat, most often 22 to 24 carat; lower carats are paler and greener. Imitation or composition leaf, such as Dutch metal, contains no gold. Put the leaf, carat and shade in the specification in writing.

Does gold leaf tarnish?

Suppliers say high-carat genuine gold often resists tarnish. Lower-carat leaf that carries more silver, silver leaf and copper-alloy imitation leaf can tarnish and are normally sealed; aluminium may darken a little. The ground and the seal are usually the weaker parts.

How do you clean a gilded chandelier frame?

Gently. The National Park Service guide says to dust gilt with a soft-bristled brush and a low-power vacuum held off the surface, and to keep hands off because skin oils speed oxidation. Do not use water, solvents, polishes or ammonia unless the gilder says so, and use the gilder’s care sheet for new work.

Can gilding be used near hot lamps or in humid rooms?

Ask for the rated temperature at the lamp holder and the humidity range, in writing; we found no source that gives a limit. Conservation research says low humidity and fast change are the main dangers to glue-and-gesso gilding, and very humid air can soften the gesso.

What should I put in a specification for gilded lighting?

The system, the leaf by name and carat, the shade, burnished and matt areas, the seal, the temperature and humidity ratings, an approved sample board on the same base material, and a care sheet for the handover pack. The wording below covers each.