How to Clean Alabaster Lamps and Light Fittings

Alabaster is a soft stone. Roughly 2 on the Mohs scale, which means a fingernail marks it and a scouring pad destroys it. It is also gypsum, and gypsum is slightly soluble in water. Almost everything that goes wrong with an alabaster light comes from treating it like marble.

The good news is that the correct method is easier than the wrong one.

First, switch it off

Turn the fitting off at the wall switch, and ideally at the consumer unit if you are going to handle the lamp holders. Let the bulbs cool completely. Alabaster holds heat, and a warm shade will flash-dry any moisture into a mark.

The short answer

A dry, soft cloth. Microfibre or a clean lint-free duster. Work gently over the surface and that is genuinely all most alabaster ever needs.

Dust is the main enemy, because alabaster has a slightly porous surface that holds it, and because dust sitting on a warm shade slowly bakes on. Dust it when you dust everything else and you will never need to do anything more aggressive.

Why water is a problem

Gypsum dissolves in water. Slowly, but it does. A splash wiped off immediately will do nothing at all. Water left sitting on the surface, or a soaking cloth worked over the stone repeatedly, will dull the polish, raise a faint white bloom, and in bad cases pit the surface.

So alabaster can get wet briefly. It must not stay wet.

Marks that will not dust off

For fingerprints, cooking film in a kitchen, or a mark that dusting has not shifted:

1. Dampen a soft cloth with distilled water. Not tap water, which leaves mineral deposits on a stone that shows them. Wring it out until it is barely damp, not wet.

2. Wipe the marked area only, lightly, in one direction.

3. Dry it immediately with a second clean, dry cloth. Do not let it air dry.

If that has not worked, stop. Repeating it harder will not help and will start to dull the finish.

What about alabaster that has yellowed?

This is the question we are asked most, and the honest answer is not the one people want.

Yellowing in old alabaster is usually decades of accumulated surface oils, smoke and dust, combined with heat damage from incandescent bulbs that ran at temperatures no modern lamp gets near. Some of it sits on the surface. Much of it has migrated into the top layer of the stone.

The surface component sometimes lifts with the barely-damp distilled water method above. The rest does not come out, and every method that promises it will is worse than the yellowing. Bleach breaks down the stone. Hydrogen peroxide poultices are a conservation technique that takes days, needs the piece dismantled, and goes badly wrong in inexperienced hands. Acetone strips any wax finish and leaves the surface looking dead.

On an antique, gentle yellowing is patina and most people come to prefer it. On a piece you cannot live with, a stone conservator is the only sensible route.

Preventing it is easy: use LED or low-wattage lamps, which is what modern alabaster fittings are designed around anyway.

Never use these

Vinegar. This is the big one, because so much household cleaning advice recommends it. Vinegar is acetic acid and it attacks gypsum directly. It will etch the surface permanently, often within seconds. The same goes for lemon juice and any descaler.

Bleach. Damages the stone and does not fix yellowing.

Glass cleaner and general purpose sprays. Usually contain ammonia or alcohol, both of which strip the finish.

Abrasives. Cream cleaners, scouring pads, magic sponges. On a stone this soft they are sandpaper.

Oil soaps and furniture polish. They soak into porous stone, darken it unevenly and attract dust.

Steam cleaners. Hot water under pressure on a water-soluble stone.

Bulbs matter more than cleaning

The single best thing you can do for an alabaster light is put a cool-running lamp in it.

Heat is what drives long term yellowing, and it also expands the stone unevenly, which over many years can open hairline cracks along natural veins. LED lamps run cool enough that neither is a concern.

Check the holder type before you buy replacements. Some alabaster wall lights use mains voltage G4 lamps, which look identical to the 12V low voltage G4 lamps sold everywhere and are not interchangeable. Fitting the wrong one either does nothing or fails immediately. If the fitting is hardwired with no transformer, it wants the mains voltage version.

Where you put it matters too

Alabaster is for indoor use. Keep it out of bathrooms where it will sit in steam, off exterior walls, and away from anywhere it gets rained on through an open window. A hallway, bedroom, living room or dining room is ideal.

Kept dry and lit with cool lamps, alabaster lasts indefinitely. There is plenty of nineteenth century alabaster still in excellent condition, and the only thing it has had is dusting.

Our fittings

Every piece in our alabaster lighting collection is carved from natural stone, so the care above applies to all of it. If you want to understand the material itself first, start with what is alabaster.

Questions about a fitting you already own, ours or otherwise, call 0330 133 6617.