What color combinations are typical for Altocumulus Castellanus (ACC) clouds?

Altocumulus Castellanus clouds are characterized by their puffy appearance and typically form at middle altitudes. The color of these clouds can range from white to grey, or a combination of both. When sunlight hits these clouds, they often appear bright white against a blue sky. However, under certain lighting conditions or when they are associated with more moisture or overcast conditions, they can take on a grey appearance. This variability in coloration reflects the cloud's thickness, the level of sunlight, and the overall atmospheric conditions. Thus, the combination of white, grey, or both accurately describes the typical colors of Altocumulus Castellanus clouds.