By saying slate you're saying very little – if anything at all. There are many different (and I do mean different) kinds of slate that span from dense and (almost) acceptable rocks, to slate that will actually fall apart under running water, and everything in between.
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: 262
Created On: Sun, Jul 29, 2007 at 2:59 AM
Last Updated On: Sun, Jul 29, 2007 at 12:00 AM
Authored by: Maurizio Bertoli [mail@mbstone.com]
Online URL: https://marblecleaning.org/knowledgebase/article.php?id=262