If the stone was limestone it's probably just moisture and will lighten
up when dry

On 8/11/2015 1:43 PM, Chris wrote:
> Hello partners
>
> I received an email today :
>
> My tile guy put in shower floor today, natural stone pieces, it was a very light grey, he grouted with a silver unsanded grey grout. The tiles now look a brownish tone. We are wondering what caused this, and we can do to fix it.
>
> I've seen iron stains that have developed over time from too much moisture. This sounds like it happened instantaneous.
> Any thoughts?
>
> Thanks Chris
>
>
> Sent from my iPhone
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