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



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