Bleach or peroxide should do the trick-purple indicates a presence of manganese-could be in the water.
Iron out is a combo of two acidic salts that eat rust.
Are you sure you had a rust stain?
Rsr2000 is ammonium thioglycolate which is a weak acid- also known as perm salt cause women use it for hair perms.
It is good as a tester for rust but sucks as an actual remover as it can create new purple stains if you are trying to remove anything larger than a small rust stain. 


On Tue, Mar 18, 2014 at 9:18 AM, John Freitag <jfreitag@thestoneandtileschool.com> wrote:
Not sure why you are getting the blue color, when you covered you poultice
did you tape the poultice down with blue tape?

I would recommend a poultice using a peroxide 40 to 50 volume and try to
remove the blue stain.


John E Freitag
Director
The Stone & Tile School
Office 407-567-7652
Cell 407-615-0134
jfreitag@thestoneandtileschool.com



www.thestoneandtileschool.com



-----Original Message-----
From: Dayron [mailto:dayron@perfectmarblefloors.com]
Sent: Monday, March 17, 2014 6:38 PM
To: Stone and Tile PROS Technical Support
Subject: [sccpartners] Iron out poultice leaves blue/purple stain

I have this Calcutta floor which I had poultice with iron out 1/3,
diatamacoius earth 2/3.  I did half of the home and it did great, but did
the other half of home and it left these ugly blue/ purple stains. Has
anyone incountered this and if you have what did you do to get rid of it




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Stu Rosen
201-446-1200
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