I don&#39;t have any idea what the staining is but I have seen it happen on the same type of stone that has been sitting in a shipping crate, left out in the weather and this had occurred prior to installation. I had thought it was some sort of brown manganese staining but not sure. They ended up removing the stone and the stain does not go all the way through, it is just about 1/16 - 1/8 beneath the surface and only along the grout joints. I am pretty sure it involves moisture that is reacting with some type of mineral in the stone, but what I don&#39;t understand is that the grout also has the staining all the way through.<div>
<br></div><div>Thanks <br><br><div class="gmail_quote">On Fri, Sep 24, 2010 at 12:32 AM, Fred Hueston <span dir="ltr">&lt;<a target="_top" href="mailto:fhueston@gmail.com">fhueston@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Rule number one in stain removal....ID the stain. you have any idea what the stain is, once you do than you can apply a poultice or the new Stain Sponge<br><br><div class="gmail_quote"><div class="im">On Fri, Sep 24, 2010 at 2:51 AM, Stephen Webb <span dir="ltr">&lt;<a target="_top" href="mailto:stephen@newlifemarblerestoration.com" target="_blank">stephen@newlifemarblerestoration.com</a>&gt;</span> wrote:<br>

</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





<div bgcolor="#ffffff"><div class="im">
<div><font face="Arial" size="2">Greg, maybe try a diluted ammonia poultice. 
I&#39;ve seen similar stains and had some success. </font></div></div><div><div></div><div>
<blockquote dir="ltr" style="padding-right:0px;padding-left:5px;margin-left:5px;border-left:#000000 2px solid;margin-right:0px"><div class="im">
  <div style="font:10pt arial">----- Original Message ----- </div>
  <div style="background:#e4e4e4;font:10pt arial"><b>From:</b> 
  <a title="info@surfaceshawaii.com" href="mailto:info@surfaceshawaii.com" target="_blank">info 
  @surfaceshawaii.com</a> </div>
  <div style="font:10pt arial"><b>To:</b> <a title="sccpartners@stoneandtilepros.com" href="mailto:sccpartners@stoneandtilepros.com" target="_blank">Restoration and Maintenance</a> 
  </div>
  <div style="font:10pt arial"><b>Sent:</b> Thursday, September 23, 2010 2:38 
  PM</div>
  <div style="font:10pt arial"><b>Subject:</b> RE: [sccpartners] Dark brown 
  stains on limestone</div>
  <div><br></div>the area is outside, about 100 sqft and I have tried just about 
  every form of acid or flouride cleaner, and even mold cleaners. What seemed to 
  work the best are the acids, but they just etch off what is on the surface and 
  whats in the picture is what is left over. Also tried grinding but to no 
  avail. The only thing I can think of trying next is some form of poultice.
  </div><div><div></div><div class="h5"><div>fiAny ideas?</div>
  <div><br></div>
  <div>thanks<br><br>
  <div class="gmail_quote">On Thu, Sep 23, 2010 at 2:21 PM, <span dir="ltr">&lt;<a target="_top" href="mailto:info@restoreyourtiles.com" target="_blank">info@restoreyourtiles.com</a>&gt;</span> 
  wrote:<br>
  <blockquote class="gmail_quote" style="padding-left:1ex;margin:0px 0px 0px 0.8ex;border-left:#ccc 1px solid">
    <div>You need to include more info like is this inside or outside, 
    how big is the stained area, possible orgin etc...<br><br>Sent via 
    BlackBerry from T-Mobile<br><br>-----Original Message-----<br>From: Greg 
    Cook &lt;<a target="_top" href="mailto:info@surfaceshawaii.com" target="_blank">info@surfaceshawaii.com</a>&gt;<br>Date: 
    Thu, 23 Sep 2010 11:29:00<br>To: Restoration and Maintenance&lt;<a target="_top" href="mailto:sccpartners@stoneandtilepros.com" target="_blank">sccpartners@stoneandtilepros.com</a>&gt;<br>Reply-To:&quot;Restoration 
    and Maintenance&quot; &lt;<a target="_top" href="mailto:sccpartners@stoneandtilepros.com" target="_blank">sccpartners@stoneandtilepros.com</a>&gt;<br>Subject: 
    [sccpartners] Dark brown stains on limestone<br><br></div>
    <div>
    <div></div>
    <div>Does anyone know if these stains can be 
    removed?<br><br>Kindly,<br>Greg Cook<br><a target="_top" href="http://surfaceshawaii.com" target="_blank">surfaceshawaii.com</a><br>808.891.1963<br><br>--<br>Powered by 
    <a target="_top" href="http://DiscussThis.com" target="_blank">http://DiscussThis.com</a><br>Visit list archives, subscribe, 
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Start 
    a new conversation (thread): <a target="_top" href="mailto:sccpartners@stoneandtilepros.com" target="_blank">sccpartners@stoneandtilepros.com</a><br><br><br><br><br>--<br>Powered 
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Start 
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  <div><font face="verdana, sans-serif"><span style="font-size:large"><font color="#333333">Greg Cook</font></span></font></div>
  <div><font face="verdana, sans-serif"><span style="font-size:large"><font color="#333333">Surface Solutions Inc.</font></span></font></div>
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</blockquote></div><br><br clear="all"><br>-- <br>Frederick M. Hueston PhD<br><a target="_top" href="http://www.stoneforensics.com" target="_blank">www.stoneforensics.com</a><br><a target="_top" href="http://www.stoneandtilepros.com" target="_blank">www.stoneandtilepros.com</a><br>

Recommended stone care products  <a target="_top" href="http://www.stonecarecentral.com/?Click=2149" target="_blank">http://www.stonecarecentral.com/?Click=2149</a><br><br>Many of my informational articles can be found at <a target="_top" href="http://www.thestonedude.blogspot.com" target="_blank">www.thestonedude.blogspot.com</a><br>

Listen to my radio show at <a target="_top" href="http://www.blogtalkradio.com/drfred" target="_blank">www.blogtalkradio.com/drfred</a><br>888-314-9077<br>702-314-1017<br><div>Cell 321-514-6845</div><div><div></div><div class="h5"><br>

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