No. Brass and bronze are copper alloys and are not ferromagnetic, so a magnet will not stick to them. If a magnet sticks firmly to a brass coloured object, there is steel underneath and the brass is only a plating. A magnet falling off does not prove solid brass, because zinc alloy is not magnetic either.

What is the difference between brass and bronze?

Brass is copper alloyed with zinc and is yellow. Bronze is copper alloyed with tin and is browner and harder. Bronze costs more because tin costs more than zinc, which is why small decorative cast animals are nearly always brass.

How can I tell if something is brass plated?

Check a magnet first, which will stick if the core is steel. Then weigh the object and measure its volume by water displacement: solid brass comes out near 8.5 grams per cubic centimetre, while zinc alloy is nearer 7 and a hollow plated shell far lower. A tiny scratch in a hidden spot will also show a different colour under the surface.

The brass menagerie

Brass versus bronze versus brass plated: what you are actually buying

2 November 2026 · 6 min read

Three phrases do most of the work in product listings for small metal objects: solid brass, bronze, and brass finish. The first two are claims about what the metal is. The third is a claim about what colour it is, and it is doing a great deal of quiet work. The difference matters because it decides what happens to the object after a few years of being touched.

The two alloys, in one paragraph each

Brass is copper alloyed with zinc. Decorative cast brass is commonly somewhere around 60 to 70 percent copper, with the balance mostly zinc and sometimes a little lead or tin to help it machine and pour. More copper makes it redder, more zinc makes it paler and yellower. It is relatively soft, it casts and machines easily, and it melts a few hundred degrees below steel.

Bronze is copper alloyed with tin, often with small additions of zinc, lead or phosphorus. It is harder than brass, it is browner and slightly pinker in colour, and it has been the metal of bells, bearings and statuary for several thousand years because it is tough and casts well at the size of a cathedral door. It melts higher than most brasses, though both sit below the melting point of steel.

Both are copper alloys, so both tarnish by the same mechanism: the copper reacts with sulphur compounds and oxygen in the air. The end colours differ. Brass tends towards brown and then near black indoors. Bronze goes a deep chocolate brown, and outdoors over decades it goes green.

What the difference actually means for an object on a shelf

Less than the words suggest. Both are dense, both are heavy for their size, both age, and both are solid metal all the way through. Bronze is slightly denser, around 8.8 grams per cubic centimetre against roughly 8.5 for brass, which is nowhere near enough of a gap to feel by hand.

The honest differences are colour and price. Bronze reads brown where brass reads yellow, which is a real decision if the object is going next to warm wood or cool stone. And tin costs considerably more than zinc, so bronze costs more to make. That is the reason almost every small decorative cast animal on the market is brass rather than bronze: at this size and price, nobody is paying for tin.

So if a listing for a cheap small figure says bronze, treat it as a colour word until proven otherwise. Antique bronze, bronze tone and bronze finish all describe a dark brown plating or coating, not an alloy.

Brass plated, and why the words matter

Brass plated means a thin layer of brass, or something brass coloured, deposited on a different metal underneath. The usual substrates are steel, zinc alloy, or occasionally plated plastic. The layer is thin: electroplating for decorative work is typically measured in microns, often only a handful, which is thinner than a sheet of paper by a wide margin.

When new, it looks correct. It fails from the high points inwards, because that is where fingers and cloths touch, so corners, edges and raised detail go first. What appears underneath depends on the substrate. Steel rusts, and you get an orange bloom that spreads under the remaining plating. Zinc alloy goes dull grey white. Neither can be repaired at home, and neither can be polished out, because polishing removes more plating.

The vocabulary to watch is consistent across the industry. Brass finish, brass tone, brass coloured, gold tone, antique brass and brushed brass are all descriptions of appearance. Solid brass, cast brass and brass alloy are claims about the material. If a listing uses only the first kind of phrase, that is usually deliberate.

The magnet test, and exactly what it proves

Copper alloys are not ferromagnetic, so neither brass nor bronze attracts a magnet. Steel does, strongly. So a fridge magnet that grabs an object with a brass coloured surface tells you there is steel in there, which means the brass is a coating. That is a useful, fast and completely reliable negative test.

What it does not do is prove solid brass. Zinc alloy is not magnetic either, and nor is aluminium, and nor is plastic. A magnet that falls off tells you the piece is not plated steel, and nothing more than that. This is the single most common mistake in home testing, and it is the reason zinc alloy castings with brass plating sell as easily as they do.

Three tests that finish the job

Density. Weigh the object on a kitchen scale, then measure its volume by displacement: fill a measuring jug with water, note the level, lower the object in on a thread, note the new level. Grams divided by millilitres displaced gives you grams per cubic centimetre. Around 8.5 is brass, around 8.8 is bronze, around 7 is zinc alloy, 7.9 is steel, 2.7 is aluminium. For a plated hollow piece the number will be absurdly low. This is the test that settles arguments.

Scratch. Find somewhere that never shows, the underside or inside a recess, and drag a needle or the corner of a file across it. Solid brass is the same yellow under the surface as on it. Plated metal shows a different colour within a fraction of a millimetre, usually grey or white. Keep it small, because you are damaging the object on purpose.

Sound and construction. Set the object down on a hard surface. Solid metal thuds. A plated hollow shell gives a short ring. Then look at the base: a real casting has a filed sprue scar and often a faint parting line, whereas a plated piece is frequently too clean, with a perfectly smooth underside and no evidence of how it was made. A cast brass kingfisher and a brass plated one can look identical from the front and tell you everything from behind.

Antiqued finishes, and what they hide

An antiqued brass finish is normally made by chemically darkening the surface, often with a sulphide based solution, then relieving the high points back to bright metal with an abrasive, then sealing the whole thing with a clear lacquer. It is a legitimate finish and it looks good.

The thing to understand is that it tells you nothing about the metal. You can antique solid cast brass and you can antique brass plated zinc, and once lacquered the two are very hard to tell apart by eye. The lacquer also means the object will not age at all until the coating starts to fail, at which point it ages in patches.

So an aged looking finish is not evidence of solid metal, and a bright yellow finish is not evidence of plating. The tests above are the only way through, and the fastest route of all is to ask.

What to ask a seller

Four questions, and any seller who knows their stock can answer all four in a sentence: solid or plated, cast or stamped, lacquered or bare, and what does it weigh. A refusal to answer the first one is an answer.

For our own part: the brass menagerie is solid cast brass, not plated, and it is not lacquered, which means every piece will darken over time and will darken fastest where it is handled. A piece like the cast brass owl will not look the way it looks in the photograph in three years, and that is the deal rather than a flaw. If you want a small metal object that stays exactly as it arrives, you want something lacquered, and you should buy it from somebody who says so.

Questions people actually ask

Is brass magnetic?: No. Brass and bronze are copper alloys and are not ferromagnetic, so a magnet will not stick to them. If a magnet sticks firmly to a brass coloured object, there is steel underneath and the brass is only a plating. A magnet falling off does not prove solid brass, because zinc alloy is not magnetic either.
What is the difference between brass and bronze?: Brass is copper alloyed with zinc and is yellow. Bronze is copper alloyed with tin and is browner and harder. Bronze costs more because tin costs more than zinc, which is why small decorative cast animals are nearly always brass.
How can I tell if something is brass plated?: Check a magnet first, which will stick if the core is steel. Then weigh the object and measure its volume by water displacement: solid brass comes out near 8.5 grams per cubic centimetre, while zinc alloy is nearer 7 and a hollow plated shell far lower. A tiny scratch in a hidden spot will also show a different colour under the surface.