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Black surface on White Bronze


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

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

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.


Wow the detail, I am impressive with.

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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.