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Spots on my carpeting?

last month

I have off-white carpeting, which was installed many years ago. It has held up well, but we are seeing small blue-green spots appearing in random places, for no apparent reason. Coincidentally (?), the padding under the carpet was about this same color. Does padding degrade over time and shed its color upward through a light-colored carpet? I've placed a pencil in the photo for size comparison. This photo was taken in a closet, where there is very little foot traffic, and the door remains open so the temperature and humidity are consistent with the rest of the home. I have had little success in trying to remove these spots. Does anyone have any wisdom to share with me?

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