I would beware of "dark granite" if it is doctored or even if it is a true granite like black galaxy or absolute it could be turn into a bad situation.I don't know your experience at face polishing granite but if you do decide take the job I would approach it with a clear understanding of expectations and a contract between you and the client.

--- On Wed, 2/18/09, Roger Konarski <qm144@yahoo.com> wrote:
From: Roger Konarski <qm144@yahoo.com>
Subject: RE: [sccpartners] Granite - Sulfuric acid
To: "Restoration and Maintenance" <sccpartners@stoneandtilepros.com>
Date: Wednesday, February 18, 2009, 4:47 PM

You have to cut below the white area. Drano and liquid plumber does the same thing. A big consideration is make sure you feel compfortiable top polishing granite. You might want to practice on scrap piece!

--- On Wed, 2/18/09, Don Semi <don@srsdenver.com> wrote:
From: Don Semi <don@srsdenver.com>
Subject: [sccpartners] Granite - Sulfuric acid
To: "Restoration and Maintenance" <sccpartners@stoneandtilepros.com>
Date: Wednesday, February 18, 2009, 6:14 PM

Hello all:
 
Again, thanks in advance for any help provided. Responses are always a help. Latest issue, custy has "dark granite", I have not seen it yet. Cleaned kitchen drain with Sulfuric acid, wiped up the mess with a rag and then set rag on granite counter. Says it is eating the granite , whitish. I believe him but is there anything that can be done. Cannot see him until Saturday so was looking for some help. I know hydrofluoric acid will cause problems but then what to do about it. Can it be repaired through face polishing?
 
thanks

--
Sincerely:

Don Semi
Stone Restoration Services - Denver
Dedicated to the Preservation of Fine Surfaces
don@srsdenver.com
303-249-7909