Rainclouds are a dark grey because they are thick enough to prevent light from penetrating through them from above, and absorb enough of the sun’s scattered light to reflect a dark grey tone to the observer. Sometimes a cumulus cloud can be white on top and grey on the bottom, this is because the larger drops gather near the bottom of the cloud and absorb more light, reflecting back grayer tones instead of white.
Rain clouds are dark grey because they block the sunlight. There could also be other reasons, like the clouds could be blocking other clouds or the sun could be setting and shining on the top clouds (making the top clouds appear white and the bottom grey).
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