Yes I looked at that stain last night on a larger screen-try using alpha R2000 just to test to see if it is iron.
I am not sure its iron-the vana trol is a dilution of Hydrochloric acid so be careful with it-
Replacing that piece seems the easiest and most predictable action. 

On Sun, Apr 10, 2016 at 2:58 PM, Adam Bartos <info@restoreyourtiles.com> wrote:

I was going to check on it yesterday but didn't make there so this week on Tuesday I will be back.
I found that bleach, hydrogen peroxide or iron out didn't do anything. So I used vina-trol from prosoco and 3" puck from 400g monkey pad. It seemed better but after trying all that stuff, stone was very wet and need to be dried. I am optimistic that it helped but need to check on it  in few days. I set fan and dehumidifier running next to it. Will see what happens.

On Apr 10, 2016 1:00 PM, "stuart rosen" <mail@stoneshine.com> wrote:
Adam-How did you make out with the stain-

On Thu, Apr 7, 2016 at 8:58 AM, stuart rosen <mail@stoneshine.com> wrote:
Adam
Test to see if it is rust-I would sand off using low grit sandpaper or electroplated pads 
Then reassess.

On Thu, Apr 7, 2016 at 12:30 AM, Hector Castillo <hectorcastillo@comcast.net> wrote:
If it was me look at the finish.  If you don't know try like 220 adjust from there. if you see to flat go higher in grit 340 . If you need it less go 180 or 120 or 100. Hector Castillo 



Sent from my Verizon Wireless 4G LTE smartphone


-------- Original message --------
From: Adam Bartos <info@restoreyourtiles.com>
Date: 04/06/2016 8:13 PM (GMT-08:00)
To: sccpartners@stoneandtilepros.simplelists.com
Subject: RE: Stains on limestone - urgent

John and Randywcbc@cs.com, what grit(s) would you recommend?

On Apr 6, 2016 7:20 PM, "John Freitag" <jfreitag@thestoneandtileschool.com> wrote:

I have successfully removed dark spot from limestone by dry sanding.

 

It not un common for some limestone darken when they become too wet. In this case dry sanding has worked.

 

 

John E Freitag

 

John E Freitag

Owner/Director

The Stone & Tile School

Office 407-567-7680

Cell 407-615-0134

 

 

schoollogo

 

www.thestoneandtileschool.com

 

 

 

From: list-manager@stoneandtilepros.simplelists.com [mailto:list-manager@stoneandtilepros.simplelists.com] On Behalf Of Randy Frye
Sent: Wednesday, April 06, 2016 8:26 AM
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


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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201-446-1200

"EVERYTHING MATTERS"