How do I tell if my brass fittings are actually bronze or gunmetal instead of brass?
Short answer: Brass is a copper-zinc alloy, while bronze is copper-tin and gunmetal is a copper-tin-zinc mix — visually they can look similar, especially when tarnished, so the most reliable check is an XRF reading from the buyer, since sorting these alloys by eye alone is genuinely unreliable.
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List Free →Why they’re so easy to mix up
Brass, bronze, and gunmetal are all copper-based alloys with overlapping color ranges depending on exact composition and surface tarnish. An old bronze bearing and a brass fitting can look nearly identical side by side once oxidized.
Rough visual and physical cues
Bronze tends to be harder and more brittle than brass, and often has a slightly darker, more brownish tone than yellow brass. Gunmetal — traditionally used for valve bodies, ship fittings, and bearings — often sits somewhere between the two in appearance and is denser than plain brass.
When it’s worth testing properly
For a handful of small fittings, the price difference from misidentifying one piece is trivial. For a larger mixed lot — old plumbing hardware, valve bodies, ship fittings — asking a buyer for an XRF reading before accepting a blended price is worth the extra step, since bronze and gunmetal can price meaningfully higher than plain yellow brass.
How ScrapTrade Makes This Easier
If you’re not confident sorting your own lot, listing it honestly as “mixed copper alloy — brass, possibly bronze/gunmetal” on ScrapTrade lets a buyer test and price it accurately, rather than you guessing and potentially underselling higher-value bronze mixed into a brass price.
Ready to sell or source brass scrap without the guesswork? ScrapTrade connects verified buyers and sellers with escrow-protected payments and transparent weighing.
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