Craft notes · 7 September 2026 · 4 min read
Brass, bronze or copper: choosing a warm metal
Three copper alloys that look alike on the day they are made and go their separate ways within a year.
Brass, bronze and copper are relatives. All three are copper, or mostly copper, and on the day a piece is finished they can be hard to tell apart under the same polish. The differences are in what they are like to work, what they cost, and — most of all — what they do next.
Brass
Copper with zinc. The yellowest and brightest of the three, the easiest to form and to polish, and the one most people picture when they say ‘gold-coloured metal’. Bare, it tones down within months to a softer, darker surface that deepens where hands touch it; lacquered, it stays bright and is simply wiped. Brass is the choice for warmth and shine, and for anything with a lot of hand-work in it, because it forgives the hammer and the polishing wheel.
Bronze
Copper with tin. Redder, deeper and harder than brass, slower to work and more expensive to buy, and it ages into a darker, more even patina rather than a brighter tone. It is the metal of things meant to look old well: a door that will be touched for decades, a sculpture, a lift surround in a corridor that never sleeps. Where brass reads as warmth, bronze reads as gravity.
Copper
The metal itself. Pinker and softer than either alloy, wonderful to beat and emboss, and the fastest to change: dull within weeks, brown within months, and — outdoors, over years — the green that people picture. For structure it is not used; for a surface that is meant to be alive, nothing else does what it does.
Choosing
Ask what the piece should look like in five years, not on the day it is installed. If the answer is ‘the same’, choose the metal and lacquer it, or choose a coloured stainless steel that will not move. If the answer is ‘better’, choose bare brass or bronze and let it go. If the answer is ‘I want to watch it change’, it is copper.
