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I think that's the part Max was talking about with the leftovers of the acid. On mine that part was pretty resilient to all of the polishing I did. I didn't need to sand in that area, but I'm sure...

Here's mine that is gold wash:

http://www.flickr.com/photos/robhawkey/4595980512/in/set-72157623909000293/

This did not survive even a single wipe of Maas metal polish which I did before hand...