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Dark spot on marble tile

Jen M
2 months ago
last modified: 2 months ago

What is this dark gray spot on my new white Carrera marble shower tiles? The tile was installed several weeks ago but was not used or exposed to water (as the house was under construction) until about 48 hours after it was cleaned, allowed to dry, and then sealed last week. After about a week of daily use, this grey spot developed in one area. What is it, and how do I remove it?

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