Question

why do some cloud appear dark in colour?​

Answer 1

Answer:

Initially clouds are white because of sufficient scattering of all colors by water droplets. As the clouds grows thick, more sunlight is reflected back from them. Consequently, less sunlight reaches the cloud base, less is scattered and the cloud appears greyish or dark.

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Answer 2

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When clouds are thin, they let a large portion of the light through and appear white. But like any objects that transmit light, the thicker they are, the less light makes it through. As their thickness increases, the bottoms of clouds look darker but still scatter all colors. We perceive this as gray. If you look carefully, you will notice that the relatively flat bottoms of clouds are always a little grayer than their sides. The taller the clouds become, the grayer their bottoms look.