The water droplets in clouds are quite large; large enough to be good antennas for all colors of light. As light passes by those droplets, some of it scatters as it is absorbed by the water droplets and is reemitted by the water droplets. Since there is no color preference in this scattering from large droplets, the scattered light has the same color as the light that illuminated the cloud. But at sunrise or sunset, the sun’s light is mostly red (the blue light has been scattered away by the atmosphere before it reached the clouds) so the clouds appear red, too.
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