In short, the dust that covers the moon’s surface is a fairly good reflector of light.
So the light you’re seeing is not necessarily “the color of the moon”, rather it’s the “color of light after being bounced off the moon”.
Think about this, if you had an (insanely strong) blue flashlight, and shone it at the moon, would you expect the moon to look the color of the moon (dark grey) or would you expect it to look somewhat blue?
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