I would try poulticing it out with the iron out if it does appear to be rust.

Happy Connecting. Sent from my Sprint Samsung Galaxy S® 5

-------- Original message --------
From: Randy Frye <rfrye6@gmail.com>
Date: 04/06/2016 8:26 AM (GMT-05:00)
To: sccpartners@stoneandtilepros.simplelists.com
Subject: Re: Stains on limestone - urgent

Maybe try sanding it out if it's just on the surface   

Best Regards,

Randy Frye, CEI Surface Pros

www.ceisurfacepros.com

239-253-1991

On Apr 5, 2016, at 10:38 PM, Adam Bartos <info@restoreyourtiles.com> wrote:

Last week we cleaned limestone walls and floors for the residential customer  using our truck mount. We came back yesterday to seal the floor and were surprised by the look of one slab, with one continues stain at the bottom.  It lookes like iron oxidation and it is only 1 slab out of 6. We tried iron out but that didn't help. 
Any idea why something like that happened?
What can I use or do to remove it?
I am going back there on Thursday and I need your  help very badly. I am puzzled and without any ideas. I am attaching picture for u to see it.
Thanks
Adam Bartos
BiO Tile

 
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