Baird,
 
Are you sure the stone is etched. Many times if a silicone or similar material is used on the the seam, you will get bleeding into the stone that will give the appearance of it being etched. You can try what was suggested but if it does not work it may be bleeding. Unfortunately it is not an easy problem to solve. It will require removing the seam material and possibly poulticing.
 
 
Another reason this could be happening is from simply moisture from the cleaning process. If this is the case, it should disappear when dry
 
Dr. Fred
Frederick M. Hueston PhD
www.stoneforensics.com
www.stoneprosolutions.com

On Sun, Sep 28, 2008 at 12:42 PM, Baird Standish <bairdstandish@comcast.net> wrote:
Hi everyone. I'm looking for some advice on a little polishing conundrum.     We have a church client for whom we restored their terrazzo sanctuary floor this summer.  As part of the job we hand cleaned (but did not polish) a vertical 30' long by 15' high highly polished marble "screen" behind the alter. The cleaning worked fine, but in some areas where the marble partitions come together, the polish is gone leaving a dull butterfly effect typically extending about 2-3 inches on one or both sides of the seam and running along the seam for between 5 and 12 inches (sorry, no photos).  There are about 5 or 6 areas like this. I suspect that, in the past, volunteers cleaned the screen with some sort of cleaner that etched around the seams when not sufficiently dried after cleaning.

I am looking for something of a quick fix, perhaps a topical application like mb-8 or carnuba wax. Haven't experimented yet.  I want to avoid powder polishing the seams and  creating a situation that requires extensive powder polishing of areas beyond the seams in order to properly blend the polish and, in the process, adding time and expense that we don't have.  Thanks for any suggestions.
Baird

From the desk of
Baird Standish
Managing partner
Facility Specialists,LLC
215-732-7505

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Frederick M. Hueston PhD
www.stoneforensics.com
www.stoneprosolutions.com