could be iron oxidation also...try dry and take a moisture meter to it
On Fri, Sep 4, 2009 at 10:47 PM, Mike Marsoun <> wrote:

This is why I almost always do limestone DRY. Turbo cat, then genisis electroplated to 400 or 600 or so, maybe a quick hit with some twister pads and very little weight, vac and microfiber, seal, done!    Looks like a material, nova blue limestone. These blue/gray limestones are scary, can heat up and yellow with metal hand tools, spalling, darkening, nightmare stuff.  


From: []
Sent: Saturday, September 05, 2009 9:34 AM
To: Restoration and Maintenance
Subject: [sccpartners] Sandstone


Hi everyone


A honing was done on this sandstone with a lot of water, I think it got under the slabs and left this discoloration


Before I go see the job I wanted your opinions,


I would need them before tomorrow night


Thank you




Anthony Masecchia

Master Stone Consultant
Marble Maestro
T. 514.777.7797
F. 514.904.1815



Active MC of BNI Westmount


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