Black surface on White Bronze

Jewelry Discussion
1

Hi,

Working with White Bronze I occasionally see a black residue on the surface of some parts.

IMG_20200418_114152
IMG_20200418_1141523840×2160 1.26 MB

This part was cast along with several others in the same pour, but most of the parts came out nice and clean. See below.

Doors
Doors2120×1736 2.11 MB

Any idea what would cause that, and what is the best way to remove it? I can get some of it off in an ultrasonic but not sure what else could be done to remove it.

Thanks!

2

Wow the detail, I am impressive with.
Aaron

1 Like
3

I think it is just oxide from the casting process. Sometimes my white bronze comes out clean and sometimes not.

I clean up my castings with 3M radial discs. You might also try tumbling with steel shot and soap.