The color of the carpet appears only to indicate that such spots woud be more readily found.
Everyone seems to be describing mold/mildew which indicates moisture. Mold grows above 50% humidity especially in dark areas combined with enough heat to allow the spores to grow. Remembering that mold/mild spores are ever present and needing the aforementioned to grow they therefore were present in the carpet in question. That is why for instance wallpaper and especially vinyl wallpaper was never a good idea installed in a bathroom.
We had beige carpet in our three bedrooms and owing to traffic patterns deided to replace them. We hemmed and hawed over the three most obvious options wood, tile and carpet. After much discussion for almost a year we opted for a very high grade carpet and pad. I did make it a point to inspect the slab before they installed the carpet two of the bedrooms had a slight but lengthy crack. I am told that it would do litle good to fill them as movement would only open them again. Since they both were slight in width I acquiesced. Perhaps my information was faulty?
I have lived here for better that six years and have not found "black spots" to be a problem for us. However, given the number of those responding in the affirmative it would appear that there is obviously some commonality (defect) here. It would seem that perhaps a water restoration expert upon visible inspection could unravel the mystery.
I am sorry that you are having difficulty here and hope you all can get it permanetly resolved.
Personal Best Regards:
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