Most people will agree that the moon is a silvery white colour but depending on the state of the atmosphere it is possible for the moon to change colour. Colours that have been seen are red, orange and blue. A lot of smoke and or dust can cause the moons colour to appear changed.
Another time it can happen is when there is a huge forest fire somewhere which causes a lot of haze.This colour change is where the expression "once in a blue moon" comes from because it is unlikely that the moon could turn blue but it has been known to happen on occasion. During a total lunar eclipse the moon can appear to be a reddish colour this is because of the spread out of light by the earths atmosphere, scattered red lights find their way to the lunar surface and make the moon look red.
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