The black color could be a result of someone crystalizing a floor while the grout was still damp or somewhat wet.

John E Freitag

Owner/Director

The Stone & Tile School

Office 407-567-7680

Cell 407-615-0134

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www.thestoneandtileschool.com

From: list-manager@stoneandtilepros.simplelists.com [mailto:list-manager@stoneandtilepros.simplelists.com] On Behalf Of Roger Konarski (via sccpartners list)
Sent: Thursday, October 22, 2015 9:42 PM
To: Stone Tile Pros
Subject: Grout Lines Turning Black

This email was sent from yahoo.com which does not allow forwarding of emails via email lists. Therefore the sender's email address (qm144@yahoo.com) has been replaced with a dummy one.

I looked @ a job. White grout lines have a black residue on top. I can scratch away the black residue with a key. The question I have, why the black build up? See attached pitures.

Thanks,

Roger

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