Sounds like iron oxidation to me..There is one sure way to tell. Get hold of some Alpha RSR 2000 and place a small drop on the orange spot..If it turns purple with a five minutes its positive for iron.<br><br><div class="gmail_quote">
On Fri, Dec 10, 2010 at 7:23 PM, Excel Master Floor Care <span dir="ltr">&lt;<a target="_top" href="mailto:excelmasterfloorcare@cox.net">excelmasterfloorcare@cox.net</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
What would cause orange stains on a Carrara Marble bathroom floor?  I think it could be iron but a mold remediation contractor thinks it is a toxic microbial.  The floors are 20 to 40 years old, if not older.<br>
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Thanks for your input.<br>
<br>
Tony Warney<br>
Excel Stone and Tile Care<br>
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