Red brass: the copper-heavy brass.

More copper, more red

Brass is copper plus zinc, and red brass is what you get when copper dominates the mix — roughly four-fifths copper, with smaller amounts of tin, zinc, and lead. That copper-heavy mix is exactly why it looks redder than yellow brass: less zinc means less gold, more copper-red.

The tin is why people mix red brass up with bronze. Both hold copper and tin — but red brass is still a brass at heart, sold and sorted on its own. The classic trade example is the cast red brass used for valve bodies, around 85% copper with tin, lead, and zinc making up the rest.

Redder than brass, not as red as copper

Hold the three side by side and the order is clear: yellow brass runs gold, red brass runs a warm reddish-copper, and pure copper runs the reddest of all. Red brass sits in the middle — a coppery red-brown that's easy to confuse with bronze until you check what the piece actually was.

Tarnish dulls all of them. A file scratch on a hidden edge is the honest test: red brass scratches to a coppery red, yellow brass to gold, and plating-over-steel breaks through to gray.

Valves, pumps, and steam fittings

Red brass is a casting alloy, so it shows up where liquid metal was poured into molds: plumbing valve bodies, pump parts, pipe flanges, steam fittings, and older fire-hydrant and meter parts. If you pulled a heavy red valve out of a commercial tear-out, odds are good it's red brass.

Water meter bodies deserve their own note: many are bronze rather than red brass, and meters get separated at grading time. When in doubt, text a photo and let us call it.

What counts as clean red brass

Clean red brass is solid, free of steel and iron attachments, and not mixed with yellow brass or bronze. Pull handles, steel stems, and packing where you can. A little solder on old joints is expected; heavy solder and lead-wiped joints get handled separately.

Keep red brass in its own pile — mixed brass loads get bought as mixed, and mixed always leaves money on the table. How brass and bronze get graded explains the four levers.

Keep reading the brass & bronze dictionary.

Brass & Bronze Dictionary — the full hub of alloy-by-alloy guides. Yellow Brass — the gold-yellow workhorse. Bronze — copper plus tin, the redder family. Brass vs Bronze — the field identification guide.

Red brass questions, answered.