A client sent a photograph of a pair of brass handles eight months after delivery, worried that something had gone wrong. The handles had gone from bright yellow to a soft mid-brown everywhere except two oval patches where thumbs land, which were still bright. Nothing had gone wrong. That is exactly what unlacquered brass does, and it is either the reason to choose it or the reason to avoid it. Metal in a piece of furniture is not a fixed colour; it is a material with a trajectory, and the specification should say which trajectory is intended.
Brass, bronze and the lacquer question
Brass is a copper-zinc alloy and bronze a copper-tin alloy, and both develop a surface layer over time as the copper reacts with air and moisture. Unlacquered, that layer builds unevenly — darker where the piece is untouched, polished bright where hands rub it — and the result is the living finish people either love or find untidy. Lacquered brass keeps its factory colour for a few years and then fails in patches where the lacquer wears through, which looks considerably worse than honest ageing and is difficult to repair without stripping. The metallurgy and behaviour of these alloys is well documented by industry bodies such as the Copper Development Association, and the practical upshot is simple: choose unlacquered where hands will touch it, lacquered only where they will not.
Blackened steel and what the black actually is
Most blackened steel in furniture is either a chemical black oxide conversion, a hot gun-blue, or a wax-and-oil finish over cleaned mild steel. Black oxide is a genuine conversion of the surface, thin enough not to change dimensions, and it offers only mild corrosion resistance — it needs oil or wax to stay stable. The hand-waxed look, where the steel is degreased, heated slightly and rubbed with a hard wax, gives the mottled grey-black that reads as blacksmith work, and it will rust if it gets wet and stays wet. Powder coating is a different animal: a durable polymer film, entirely stable, and visually flatter because it hides the metal’s surface rather than colouring it.
Making a patina happen on purpose
Accelerated patination uses chemistry to reach in days where weather would take years: ammonia fuming for brass, liver of sulphur for copper and silver, ferric nitrate on steel for warm browns. All of them are sensitive to surface preparation, temperature and timing, and all of them need sealing afterwards or they keep going. The realistic approach is to make test samples on offcuts of the same metal from the same batch, record the exact dilution and dwell time, and let the client choose a sample rather than a description. Two pieces patinated a month apart in different weather will not match, which is a reason to do all the metal for one commission in a single session.
Where metal meets wood
Two practical issues. Oak and other tannin-rich timbers react with iron in the presence of moisture and produce a blue-black stain, which is charming when it is intentional ebonising and a defect when it is a rust ring around a screw head. Stainless or brass fixings in oak avoid it. The second issue is movement: a steel frame does not change dimension seasonally while a solid timber top does, so the fixing between them has to be slotted or the top will crack — the same rule as fastening a top to a wooden base, just less forgiving because steel does not yield. Powder-coated or waxed steel bases should also be finished before assembly, because touching up a coating around a fitted timber component is awkward.
Frequently asked questions
Can brass be stopped from ageing without lacquer? Regular polishing keeps it bright, which is a maintenance commitment rather than a finish. A microcrystalline wax slows the process a little and is easy to renew.
Will blackened steel mark clothing or hands? A properly waxed and buffed surface should not. If it does, the finish was not cured or buffed adequately and can usually be corrected with a further buff rather than a refinish.
How should patinated metal be cleaned? Dry dusting and occasional wax. Household cleaners, particularly anything acidic or abrasive, strip a patina in one pass, and rebuilding it to match the surrounding surface is difficult. Packing matters just as much on delivery day, and how a finished piece is crated decides whether a patinated surface arrives intact.