You might also be able to verify if it is iron oxidation with RSR-2000 and you get a reaction. It's a quicker test, I think.

Sent from a smartphone.

From: Fred Hueston <fhueston@gmail.com>

Date: Mon, 14 May 2012 03:41:22 -1200

To: Restoration and Maintenance<sccpartners@stoneandtilepros.com>

ReplyTo: "Restoration and Maintenance" <sccpartners@stoneandtilepros.com>

Subject: RE: [sccpartners] Limestone problem

looks like iron oxidation..poutlice with iron out

On Mon, May 14, 2012 at 3:33 AM, Adam <info@restoreyourtiles.com> wrote:

Adam Bartos
BiO Tile & Grout Restoration
773-575-5515 (c)
847-438-0212 (o)
www.RestoreYourTiles.com
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Frederick M. Hueston PhD
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