I run into this problem all the time..The attached article should explain it.  To sum up..Its the natural iron oxides in the stone that are rusting.

On Tue, May 23, 2017 at 10:35 AM, Ryan Tonnemacher <ryan@beyondstonesolutions.com> wrote:

Morning everyone!

 

Wanted to pick your brains on this. We are going to look at it person and wanted to know any recommendations for questions to ask/things to test for. We will be testing for moisture as always, but any other suggestions would be greatly appreciated! Thank you!

 

See email below and attached photos.

 

Thank you, we appreciate your business!

 

Ryan Tonnemacher

General Manager

(602) 993-9800 Office

(480) 459-5773 Fax

2039 E. Cedar St. #104

Tempe, AZ 85281

www.BeyondStoneSolutions.com

INSTALLATION – RESTORATION – MAINTENANCE

 

From: Jason
Sent: Monday, May 22, 2017 5:37 PM
To: Dan Brewer <Dan@beyondstonesolutions.com>
Cc: Lisa Brewer <Lisa@beyondstonesolutions.com>
Subject: White Marble Yellowing

 

Hi Dan,

 

One of my better contractors has a new shower installation of one of our white marbles which has started yellowing.  Is this something you have encountered before?  I have attached photos of two affected shower pans.

 

Thanks a ton for the time.

 

Jason

 

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