Dear Michelle:
It must have been some chemical!!
Or it must have been some “granite”!…
No matter what, without any other information and the possibility to visually inspect your sink it is impossible for me to come up with any intelligent conclusion.
Your best course of action is to consult with a reputable stone restoration contractor in your area.
May I ask you now to please read and e-sign our Statement of Purpose at:
http://www.marblecleaning.org/purpose.htm?
Ciao and good luck,
Maurizio Bertoli
Article ID: 811
Created On: Wed, Nov 21, 2007 at 7:05 PM
Last Updated On: Wed, Nov 21, 2007 at 12:00 AM
Authored by: Maurizio Bertoli [mail@mbstone.com]
Online URL: https://marblecleaning.org/knowledgebase/article.php?id=811