What oxidized actually means

Half of this catalogue is described as oxidized, and the word is doing more work than it looks like it is.

It is a surface, not a shortcut

Copper left alone goes brown and then green, unevenly, over years. An oxidized finish is that reaction brought on deliberately and then stopped: the surface is darkened, the raised areas are cut back with a burnisher so bare metal shows on the edges, and the whole piece is sealed.

What you get is a dark figure with bright highlights exactly where light would catch it. It is not a piece that failed to be gilded. It is a different decision about what the metal should look like.

Why it shows the work

Gold reflects. On a fire-gilt figure the highlights are everywhere and the eye reads the shine before it reads the shape — which is part of the point, because a gilt figure is meant to be radiant.

An oxidized figure has almost no reflection to hide behind. Every line the artisan cut into the face reads as a line, dark in the recess and bright on the edge. If you want to judge how well a piece was chased, judge an oxidized one.

How it ages

Slowly, and in the direction it is already going. Handling wears the highlights brighter and the dark stays dark, so most pieces look better after a few years — which is not something anybody says about worn plating.

Do not put metal polish on one. It takes the darkening off in a stroke and leaves a bright copper figure that cannot easily be put back. A dry cloth is the whole maintenance routine.

The other dark finishes

Antique brass is a warmer, yellower version of the same idea on a brass alloy rather than copper. Partial gilt leaves the body oxidized and gilds the robe or the ornament, which is the traditional treatment for several figures and the reason some pieces read as two-tone.