Good comment, I agree it could be from a red chalk line. What’s interesting is the red color is only on one side of the tile.

If it is a red chalk line than it should clean up with a alkaline cleaner or a mild abrasives powder, like a honing powder. If that does not work then as Fred said it could be an iron stain except it’s a very red color to be from iron but not impossible.

John E. Freitag

President/Director

The Stone and Tile School

Office 407-567-7652

Cell 407-615-0134

jfreitag@thestoneandtileschool.com

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From: Lagana Tile [mailto:glagana@comcast.net]
Sent: Tuesday, December 29, 2009 12:09 PM
To: Restoration and Maintenance
Subject: RE: [sccpartners] Red Spots on New Installation

I have seen something like that on my own jobs. In my case they caused the red chalk line.

From: rivera.gm@gmail.com [mailto:rivera.gm@gmail.com] On Behalf Of Georgia
Sent: Tuesday, December 29, 2009 5:54 AM
To: Restoration and Maintenance
Subject: RE: [sccpartners] Red Spots on New Installation

It looks like it was polished after installation. The edge seems to show that it is rounded a bit. Could this be caused by an acidic polishing substance not being neutralized?

On Tue, Dec 29, 2009 at 7:49 AM, Dr Fred <fhueston@stoneandtilepros.com> wrote:

Roger

I have seen this before and it is possible it is iron or some other mineral. One way to find out is to use a product from Alpha called RSR2000. This works great as a reagent. place a small amount on the stone and if it turns purple you have iron. Getting rid of it is another problem. A grout release may help but you may have a problem with the grout adhereing to the stone. One solution is to use an epoxy grout or you can try a grout with pure latex additive with no water.

On Mon, Dec 28, 2009 at 8:37 PM, Roger Konarski <qm144@yahoo.com> wrote:

All,

Would appreciate input on what’s causing this problem. Please see attached picture. This floor were just installed and grouted. The problem is the red stains on the edge of the tiles. What is causing the problem? My thoughts are that the moisture from the grout is oxidizing minerals in the stone. If that is the case, would applying a sealer before grout stop this from happening? They have already laid 600 sq.ft. of the tile, any suggestions on removing the red spots? I my thoughts is to try to see if it is iron that is oxidizing and taking the appropriate steps. Or trying poultice with a hydrogen peroxide.

Thanks in advance for your help.

Roger Konarski

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Frederick M. Hueston PhD
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